A List Of Most Common Laravel Errors / Exceptions

Hey there!

I see a lot of people get the same errors over and over again so I thought "why not create a list of the most common errors / exceptions people see every day when developing apps with Laravel?".

I'll start the list with a few of them:

• Class "User" not found - this means that you haven't told Laravel where to look for the class. In other words, it's looking in the wrong places (usually in the same folder/namespace where the class is called).

To fix this error, you have to either:

1. Write the use Full\Namespace\To\Class; (Example use App\User;) at the top of the file (also known as import class in PHPStorm when you click on the yellow light bulb).
2. Tell Laravel to look for it globally by adding a front slash like \Class::method() (Example: $users = \User::all())
3. Write the full namespace of the class where you use the class like Full\Namespace\To\Class::method() (Example: $users = App\User::all()).
4. If the class you just added is outside of the autoload path (the app folder, which is autoloaded by default with PSR-4), you have to run composer dump-autoload -o to load the newly added class.

Feel free to add more options by replying. I'll add everything to the list.

• NotFoundHttpException in RouteCollection.php line 143 - This usually happens when a route you tried to access does not exist or you misspelled it either in your routes.php or in your browser's address bar.

• ModelNotFoundException - This exception is thrown by either findOrFail() or firstOrFail() methods on the model ( User::firstOrFail() or User::findOrFail()). This means that the ID you are trying to get does not exist in the database.

• MethodNotAllowedHttpException - Usually happens when you try to use an HTTP method for a route but you have not defined that method in your routes file. For example, if you POST to a method, but you only define a GET method for the route in routes.php.

• TokenMismatchException - This exception is usually thrown when using forms (posting a form to a URL). To fix this problem, you have to:

1. If you are using a normal form, add a {!! csrf_field() !!} to your form. (Form::open() and Form::model() automatically generate this field if you are using the illuminate/html or laravelcollective/html (recommended) packages)
2. If you are using JavaScript/AJAX/JQuery, you have to do two things:
   • Add <meta name="csrf-token" content="{!! csrf_token() !!}"> inside the tag of your master / layout page.
   • Add the following code at top of your JS file (or in a separate file which is loaded above the file(s) you are doing the AJAX call):

$.ajaxSetup({
        headers: {
            'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
        }
});

You can read about CSRF protection in the documentation.

Feel free to add more of these errors / exceptions and some explanation when and how to fix them. I'll update this list later. Also, feel free to add or correct the current list.

Thanks!