Error Center
Common Laravel errors and their solutions.
Call to undefined function
Call to undefined function App\Jobs\str_slug()
Use the Str facade for string functions: Str::slug(), Str::limit(), etc. Or import the helper function: use function Illuminate\Support\str_slug;.
Undefined index / Undefined array key
Undefined array key "email"
Use null coalescing (??), isset(), or array_key_exists() to check for key existence. Use $request->input() with a default value for request data.
Maximum execution time exceeded
Fatal error: Maximum execution time of 30 seconds exceeded
Increase the time limit temporarily with set_time_limit(). Better yet, optimize the code, use queues for long tasks, or process data in chunks.
Allowed memory size exhausted
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 2048 bytes)
Increase memory_limit in php.ini. Better: process data in smaller chunks, use generators (yield), or use cursor-based queries instead of loading every...
Foreign key constraint fails
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails
Ensure the referenced record exists before creating the child record. Use constrained() in migrations to enforce referential integrity. Check the fore...
Unique constraint violation
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry for key
Check for existing records before inserting. Use firstOrCreate() or updateOrCreate() for upsert operations. Validate uniqueness in Form Requests.
No database selected
SQLSTATE[3D000]: Invalid database name or no database selected
Check DB_DATABASE in .env. Ensure the database exists on the server. Verify the database connection configuration in config/database.php.
Access denied for user
SQLSTATE[28000]: Access denied for user 'root'@'localhost'
Verify DB_USERNAME and DB_PASSWORD in .env. Grant the user proper permissions in MySQL. Reset the MySQL root password if needed.
Too many connections
SQLSTATE[08004] [1040] Too many connections
Increase max_connections in MySQL config. Use connection pooling. Ensure queries are using transactions properly and connections are being released. U...
MySQL server has gone away
SQLSTATE[HY000] [2006] MySQL server has gone away
Reconnect to the database by re-running the query. Increase wait_timeout in MySQL config. Use try-catch to handle disconnections gracefully.
Connection timed out
SQLSTATE[HY000] [2002] Connection timed out
Check network connectivity to the database server. Verify firewall rules. Check DB_HOST and DB_PORT. Increase connection timeout in PHP config.
Column not found in field list
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'posts.created_by' in 'field list'
Create a migration to add the missing column. Check the column name for typos. Verify the schema matches what the code expects.
htmlspecialchars() expects parameter 1 to be string
htmlspecialchars(): Argument #1 ($string) must be of type string, array given
Access the specific array key in the Blade template. Use @json() for arrays. Debug the variable to understand its structure.
Undefined variable
Undefined variable $posts (View: /resources/views/posts/index.blade.php)
Check the controller\'s compact() or view data array. Verify the variable name matches between controller and view. Use optional chaining for potentia...
Cannot redeclare class
Cannot redeclare class App\Models\Post
Clear all caches: php artisan optimize:clear. Run composer dump-autoload. Check for duplicate class definitions.
Class 'Carbon\Carbon' not found
Class "Carbon\Carbon" not found
Add use Carbon\Carbon; at the top of the file. Run composer install if dependencies are missing. Check composer.json includes nesbot/carbon.
laravel.log permission denied
file_put_contents(): Failed opening stream: Permission denied in /storage/logs/laravel.log
Fix permissions: chown -R www-data:www-data storage. Or chmod -R 775 storage. Ensure the storage directory and its subdirectories are writable.
Symlink error for storage
The file "/public/storage" does not exist
Run php artisan storage:link to create the symlink. If it fails, create it manually: ln -s ../storage/app/public public/storage
Provider not found / Target class [X] does not exist
Target class [App\Providers\EventServiceProvider] does not exist
Run composer install and composer dump-autoload. Check config/app.php providers array. Verify the package is installed.
Route [login] not defined
Route [login] not defined
Install authentication scaffolding with Breeze or Jetstream. Define a login route manually. Configure the login redirect in config/auth.php.