Common Issues with AI-Built Apps

Browse 400 step-by-step guides for the most common problems builders face with AI coding tools.

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My AI-Built App Is Broken and I Don't Know Why

My AI App Won't Deploy or Go Live

Login or Signup Not Working in My AI App

App Shows a Blank White Page After Deploy

Data Not Saving to Database in My AI App

My AI-Built App Is Really Slow

App Layout Is Broken on Mobile

Payments or Checkout Not Working in My AI App

Images Not Showing in My AI App

Email Notifications Not Sending From My AI App

API Calls Failing With Errors in My AI App

Search Feature Not Working in My AI App

Form Validation Not Working Properly

Users Can See or Do Things They Shouldn't

App Styling and Design Looks Wrong or Broken

I Hired an AI Tool to Build My Website and Now It's Broken

My AI App Crashes Randomly or Shows Error Pages

I Can't Add a New Feature Without Breaking Something

SSL Certificate Error or Site Not Secure Warning

Environment Variables Not Working in Production

Third-Party Integration Not Working (APIs, Webhooks, OAuth)

Real-Time Features Not Working (Chat, Notifications, Live Updates)

My AI App Doesn't Appear in Google Search

Password Reset Not Working

File Upload Not Working in My AI App

Dark Mode Not Working Properly

Navigation or Routing Not Working

Dates and Times Showing Wrong in My App

App Not Working on Some Browsers or Devices

Can't Connect My Custom Domain to the App

In-App Notifications Not Showing

I Want a Code Review Before Launching My AI-Built App

Users Can See Each Other's Private Data

Build Errors Preventing Deployment

Base44

40 guides

Base44 Login Page Not Loading or Showing Blank Screen

Role-Based Access Control Not Restricting Pages in Base44

Base44 Email Verification Not Sending or Failing on Signup

Google or Social Login Not Working in Base44 App

User Sessions Expiring Too Quickly in Base44 App

Form Submissions Not Saving to Database in Base44

Database Relationship and Foreign Key Errors in Base44

Unexpected Data Validation Errors When Saving Records in Base44

CSV Data Import or Migration Failing in Base44

Duplicate Records Being Created in Base44 Database

Computed or Formula Fields Not Updating in Base44

Base44 App Not Loading After Publishing

Custom Domain Not Connecting to Base44 App

SSL Certificate Errors on Base44 Published App

Base44 App Build Failing After Recent Changes

Environment Variables or Secrets Not Available in Published Base44 App

Base44 App Page Layout Broken on Mobile Devices

Forms Rendering Incorrectly or Missing Fields in Base44

Custom Styling and CSS Not Applying to Base44 Components

Conditional Visibility Rules Not Working on Base44 Components

Modals and Popups Not Opening or Closing Correctly in Base44

Data Tables and Grids Not Displaying Correctly in Base44

Navigation Menu Not Updating or Showing Wrong Links in Base44

Workflow Automations Not Triggering in Base44

Third-Party API Integration Not Working in Base44

Webhooks Not Receiving or Processing Data in Base44

Email Sending Not Working in Base44 App Workflows

Stripe Payment Integration Not Working in Base44 App

Custom REST API Endpoints Returning Errors in Base44

Zapier or Make Integration Disconnected from Base44 App

Slow Page Load Times in Base44 Application

Large Data Sets Causing Timeouts and Crashes in Base44

Image Upload and Display Performance Issues in Base44

Dashboard Charts and Analytics Loading Slowly in Base44

Search Functionality Slow or Returning Wrong Results in Base44

File Downloads and Data Exports Timing Out in Base44

Real-Time Data Updates Not Reflecting in Base44 App

PDF Generation and Report Creation Failing in Base44

Multi-Language and Internationalization Issues in Base44 App

File Upload Functionality Broken or Failing in Base44

Claude Code

42 guides

Database Transaction Not Rolled Back on Error

OAuth Token Lost Between Sessions

GitHub Token Missing Required Scopes

Authentication Middleware Not Blocking Unauthenticated Requests

Database Migration Silently Fails, Schema Mismatch

ORM Lazy Loading Disabled, Performance Regression

Database Seed Data Not Loaded on Startup

Docker Build Fails Due to Dependency Conflicts

CI/CD Pipeline Missing Environment Variables

Gradle Build Cache Causes Stale Artifacts

UI Component Not Rendering After State Update

CSS Styles Not Applied, Specificity Issue

Form Validation Logic Partially Implemented

Frontend Not Integrated with API Endpoint

Webhook Handler Not Processing Events

Stripe Webhook Events Not Being Processed

API Response Structure Doesn't Match Frontend Expectations

N+1 Query Problem Causing Performance Degradation

Memory Leak in Long-Running Background Job

Inefficient Algorithm Causing Request Timeouts

Dependency Adding 500KB to Bundle Size

Race Condition in Async State Updates

Configuration File Not Loaded from Environment

Circular Dependency Breaking Application Startup

Permission Denied When Writing Files

SSL Certificate Validation Failure on HTTPS Calls

Server-Side Template Syntax Errors

Event Handler Not Triggered on Click

CORS Preflight Request Failing

JWT Token Validation Failing Unexpectedly

Password Hashing Not Secure Enough

SQL Injection Vulnerability in Query

XSS Vulnerability in Template Output

Database Deadlock in Concurrent Updates

Redis Connection Pool Exhaustion

Callback Hell Making Code Unmaintainable

Memory Overflow from String Concatenation in Loop

WebSocket Connection Dropped Unexpectedly

CORS Wildcard Allow-Origin Too Permissive

Rate Limiting Not Enforced on API Endpoint

Logging Configuration Not Producing Output

Bean Validation Annotations Not Triggered

Bolt

48 guides

OAuth2 Provider Not Configured - Missing Client ID

Session Lost on Page Refresh - Auth State Not Persisting

Protected Routes Redirecting Unauthenticated Users Incorrectly

JWT Token Validation Fails - Invalid Signature or Expiration

Prisma Connection Pool Exhausted - Cannot Connect to Database

Prisma Migration Failed - Schema Mismatch

Supabase Connection Timeout - Auth or Database Requests Hang

Firebase Auth Not Initializing - Authentication Fails

Blank Page After Deploy to Vercel/Netlify

Environment Variables Not Loading - Undefined in Build

Build Fails - Memory Limit Exceeded or Process Killed

Vercel Serverless Function Timeout - API Routes Taking Too Long

Netlify Build Plugin Configuration Error

React Component Not Rendering - Component Returns Nothing

Tailwind CSS Classes Not Applying - Styles Ignored

Hydration Mismatch Error - Server and Client Render Different Content

React State Not Updating - Component Doesn't Re-render

Event Handlers Not Firing - onClick, onChange Not Working

Image Element Not Displaying - src Attribute Issues

Form Submission Not Working - Form Doesn't Send Data

API Route Returns 500 Error - Internal Server Error

CORS Error - Cross-Origin Request Blocked

API Request Timeout - Endpoint Takes Too Long

Webhook Not Receiving Requests - Events Not Triggered

Payment Processing Failed - Stripe Integration Error

Slow Bundle Build Time - Build Takes Too Long

Large Bundle Size - App Loads Slowly

Memory Leak - Component Doesn't Clean Up Resources

WebContainer Slow Startup - App Takes Time to Boot

React Re-rendering Causing Performance Issues - Slow Interactions

ESLint Error Blocking Build - Build Fails on Lint

TypeScript Compilation Error - Type Mismatch

Dependency Version Conflict - Incompatible Package Versions

Next.js Image Component Optimization Error

Font Loading Causing Layout Shift - FOUT or FOIT

Modal Dialog Accessibility Issues - Focus Trap Not Working

Form Validation Not Working - Errors Not Showing

Infinite Redirect Loop - Auth Redirect Not Ending

CORS Preflight Request Timeout - OPTIONS Request Failing

Rate Limit Exceeded - Too Many API Requests

Database Query Timeout - Complex Queries Too Slow

Database Connection Leak - Connections Never Close

Redis Cache Returning Stale Data - Cache Not Invalidating

GraphQL Query Too Deep - Nested Query Recursion Attack

WebSocket Connection Fails - Real-time Features Not Working

Long-Running Job Timeout - Background Tasks Interrupted

Email Sending Fails - Emails Never Received

File Upload Exceeds Size Limit - Large File Rejection

Replit

51 guides

Multipart Form File Upload Issues on Replit

SQL Injection Vulnerability on Replit

High Token Usage from AI Agent on Replit

AI Agent Accuracy Poor on Replit

Thymeleaf Static Resource Caching Issues

Kotlin Compilation Error on Replit

OAuth Setup Failing on Replit

Session Lost After Replit Restart

GitHub Token Rejected on Replit

Two-Factor Authentication Required for Replit Secrets

PostgreSQL Connection Refused on Replit

PostgreSQL Max Connections Exceeded

Flyway Database Migration Failed on Replit

SQLite Database Locked on Replit

Slow Database Queries on Replit

HikariCP Connection Pool Misconfigured

App Crashes Immediately After Deploy on Replit

Port Already in Use on Replit

.replit Config File Invalid on Replit

Reserved VM Insufficient Memory

Deployment Timeout on Replit

Static Files Not Serving on Replit

Thymeleaf Template Processing Error on Replit

WebSocket Connection Failed on Replit

Mobile Responsive Design Broken on Replit

CORS Preflight Request Blocked on Replit

API Endpoint Returns 404 on Replit

External API Calls Timing Out on Replit

Third-Party API Rate Limiting on Replit

JSON Parsing Error in API Response

Slow Application Startup on Replit

High Memory Usage on Replit

Slow Cold Start on Replit

Nix Environment Missing Dependency

Gradle Build Very Slow on Replit

AI Agent Loops Forever on Replit

Async Request Timeout on Replit

Spring Actuator Endpoints Returning 401

Stripe Webhook Signature Invalid on Replit

Using Stripe Test Keys in Production

Stripe Idempotency Key Not Implemented

Stripe Webhook Not Triggering on Replit

Environment Variable Not Set on Replit

Mixed HTTP/HTTPS Content on Replit

Request Validation Failed on Replit

Circular Dependency in Spring Beans

CSRF Token Bypass on Replit

Remember-Me Token Security Issue on Replit

XSS Vulnerability in Thymeleaf Templates

CORS Credentials and Cookies Not Sent

Gradle Version Mismatch on Replit

Lovable

53 guides

Tailwind Config Changes Not Reflecting in Dev

Supabase Auth Session Not Persisting Across Page Reloads

Row Level Security (RLS) Policy Blocks All Database Access

OAuth Callback URL Mismatch with GitHub/Google Provider

JWT Token Expires Silently Causing Unexpected Logout

Data Not Saving to Supabase Database

Realtime Subscriptions Not Receiving Updates

Database Migration Fails During Deployment

Foreign Key Constraint Violation on Delete/Update

N+1 Query Problem Causing Slow Database Performance

CORS Error in Production Blocking Supabase Requests

Vite Build Produces Blank Page in Production

Environment Variables Undefined in Production Build

Mobile Layout Broken on Small Screens

Tailwind CSS Classes Not Applying or Conflicting

Dark Mode Not Toggling or Persisting

React Form Input Values Not Updating or Showing Stale Data

Modal or Dialog Not Closing Properly

Supabase Edge Function Timeouts or Fails to Execute

Webhook Not Receiving Events from Supabase

Third-Party API Calls Blocked by CORS

Stripe Webhook Signature Verification Failing

Slow Initial Page Load and Time to Interactive

React Components Re-rendering Excessively

Images Not Optimized Causing Large File Sizes

RLS Allows SELECT But Blocks INSERT/UPDATE

Form Submission Race Condition - Multiple Submissions or Lost Data

Vite Hot Module Replacement (HMR) Connection Fails

Supabase Storage Bucket CORS Error on Upload

Memory Leak from Unremoved Event Listeners

Dev Server HTTPS Needed for Secure Features

Edge Function Cold Starts Causing Slow First Invocation

Auth State Lost During Navigation or Redirect

React Hook Dependency Warning - Stale Closures

Supabase Anon Key Exposed in Client Code

CSS Specificity Issues - Can't Override Styles

Stripe Test vs Live Mode Confusion

Zustand State Not Updating in Components

Vite Path Aliases Not Resolving in Build

React Context Returns Undefined - Missing Provider

Testing Supabase Edge Functions Locally

Image Optimization in Vite React vs Next.js

Database Connection Pool Exhaustion

TypeScript Strict Mode Type Errors

Unhandled React Error Crashing App

Browser Cache Blocking App Updates

Console Logging Slowing Down React Render

Querying Supabase JSON Columns Fails

CSS-in-JS Styles Not Applying in Build

React Key Prop Warning in Lists

Infinite Loop Caused by Missing Dependency

Supabase Admin Client Bypasses RLS for Backend

React Fragment Key Warning - No Key Prop

Cursor

49 guides

OAuth Token Refresh Fails After Cursor AI Refactor

JWT Signature Invalid After Cursor Code Generation

Express Middleware Execution Order Broken After AI Edit

Redis Session Storage Fails After Cursor Refactor

CSRF Protection Accidentally Disabled by Cursor

Database Migration Rollback Fails After Cursor Changes

ORM Query Syntax Broken After Cursor Code Generation

Database Connection Pool Exhausted After Refactoring

N+1 Query Problem After Cursor ORM Refactoring

Docker Build Fails After Cursor Code Changes

Environment Variables Not Loading in Production

GitHub Actions CI/CD Workflow Fails After Changes

Build Command Broken After Cursor Project Reorganization

React Component No Longer Renders After Cursor Refactoring

CSS Styles Not Applied After Cursor File Move

Mobile Responsive Design Broken After Refactoring

State Management Not Working After Refactoring

API Endpoint Type Mismatch After Cursor TypeScript Update

API Route Returns 404 After Refactoring

Import Paths Broken After File Reorganization

API Request Missing Required Headers After Refactoring

API Response Parsing Fails After Cursor Refactoring

Bundle Size Increased After Cursor Refactoring

React Components Rerendering Excessively

Memory Leak After Cursor Refactored Cleanup Code

Database Query Performance Degraded

API Rate Limit Exceeded After Changes

React Error Boundary Missing After Cleanup

Form Validation Logic Removed by Cursor

Button onClick Handler Not Firing After Changes

Modal Dialog Stuck Open After Refactoring

Images Not Loading After Path Changes

Async/Await Promise Chain Broken

CORS Headers Missing After API Refactoring

TypeScript Strict Mode Errors After Refactoring

Webpack Configuration Broken After Edit

Prisma Migration Fails After Schema Changes

Next.js Build Error After Changes

Complete Authentication Flow Broken

Event Listener Added Multiple Times

Infinite Loop Causes App Hang

Translations Missing After i18n Changes

Stripe Webhook Endpoint Not Receiving Events

Supabase Authentication Integration Broken

GraphQL Query Syntax Error After Refactoring

Hot Module Reload Broken in Webpack Dev Server

Cache-Control Headers Set Incorrectly

Database Transaction Not Atomic After Changes

HTML Escaping Removed, Creating XSS Vulnerability

v0

38 guides

NextAuth.js Infinite Redirect Loop on Callback

Clerk and NextAuth.js Conflicting Auth Headers

Protected Routes Return Undefined Session in Server Components

Clerk Missing Environment Variables Error

Prisma Database Connection Timeout

Prisma Migration Conflict After Schema Changes

Drizzle ORM Type Generation Failed

Vercel Postgres Connection String Not Found

Neon Database Timeout in Production

Hydration Mismatch from Date/Time Rendering

Client Component Not Rendering in App Router

shadcn/ui Styling Conflicts with Tailwind

Tailwind Responsive Classes Not Working on Mobile

Next.js Image Optimization Not Working

Next.js API Route Returns 404 on POST Request

Next.js Server Action Not Callable from Client Component

tRPC Procedure Undefined or Not Found

Next.js Middleware Not Executing on Protected Routes

Vercel Build Failure: Static Generation Failed

Vercel Environment Variables Not Loading in Deployment

Vercel Edge Runtime Import or Module Error

JavaScript Bundle Size Exceeds Vercel Limit

Slow Server Components Causing High Time to First Byte

Next.js Image Optimization Cache Not Working

CSS-in-JS Runtime Overhead Impacting Performance

Database N+1 Query Problem Killing Performance

Next.js App Directory Routing Issues and Path Confusion

Form Validation Mismatch Between Client and Server

Stripe Webhook Signature Verification Failed

Stripe Checkout Session Not Matching Create/Update

React Hook Form Field Not Registering or Updating

TypeScript Strict Mode Type Errors in Next.js

Vercel Serverless Function Timeout

Supabase Row-Level Security 403 Forbidden Error

Supabase Realtime Subscription Not Updating in Real-Time

Next.js Fetch Caching Serving Stale Data

React useEffect Dependency Warning and Infinite Loops

NextAuth Session Not Persisting After Refresh

Windsurf

45 guides

Cascade Generated OAuth Token Exposed in Code

Cascade Created Login Redirect Loop

Cascade Broke Redis Session Persistence

JWT Validation Fails in Cascade-Generated Auth

Cascade Created Conflicting Database Migrations

Cascade-Generated ORM Code Causes LazyInitializationException

Cascade Generated N+1 Query Problem

Cascade Left Database Schema Out of Sync

Cascade Build Fails - Missing Dependency

Cascade Modified Dockerfile - Docker Build Timeout

Cascade Configuration - Environment Variables Not Loaded

Cascade Broke CI/CD Pipeline Configuration

Cascade Broke Payment Form UI Components

Cascade Broke Responsive CSS Layout

Cascade Removed Form Validation Logic

Cascade Generated Modal Component State Desync

Cascade Created Duplicate API Endpoints

Cascade Modified API Response Contract

Cascade Disabled Middleware - Security Filter Broken

Cascade Broke Webhook Signature Validation

Cascade Removed Rate Limiting Configuration

Cascade Generated Code with Memory Leak

Cascade Generated Inefficient Database Query

Cascade Added Large Dependencies - Bundle Bloat

Cascade Generated CPU-Intensive Loop

Cascade WebSocket Implementation Drops Connections

Cascade Broke Stripe Connect Setup

Cascade GitHub Integration - Fork Permission Denied

Cascade Email Queue Processing Halted

Cascade Broke Thymeleaf Template Rendering

Cascade Disabled Cache Invalidation Logic

Cascade Set CORS to Allow All Origins

Cascade Generated SQL Injection Vulnerability

Cascade Introduced XSS Vulnerability in Templates

Cascade Changed Transaction Isolation Level

Cascade Disabled Scheduled Tasks

Cascade File Upload Without Validation

Cascade Hardcoded Encryption Keys

Cascade Generated Code Causing NPE Waves

Cascade Referenced Missing Classpath Resource

Cascade Created Spring Bean Circular Dependency

Cascade Regex Pattern Causes Performance Catastrophe

Cascade String Comparison Locale Bug

Cascade Generated Annotation Not Recognized

Cascade Broke Object Serialization Format

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