The '419 Page Expired' error is one of the most common issues that developers face while working with Laravel forms. The error occurs when the CSRF token in the form submitted by the user does not match the expected token stored in the session.

To solve this issue, you need to make sure that you are using the correct CSRF protection feature provided by Laravel. Here are some steps to follow:

1. Ensure that you have included the csrf_field() method in your form tag. This will generate a hidden input field with the CSRF token value.

Example:

<form action="/submit-form" method="POST">
    @csrf
    <input type="text" name="username">
    <button type="submit">Submit</button>
</form>

2. If you are using Laravel's form helper methods, make sure to pass the token as a hidden input field.

Example:

{!! Form::open(['url' => '/submit-form']) !!}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{!! Form::close() !!}

3. If you are using Laravel's form builder methods, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

4. If you are using the Form::model() method, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

5. If you are using the Form::label() method, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

6. If you are using the Form::select() method, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

7. If you are using the Form::checkbox() method, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

8. If you are using the Form::radio() method, make sure to pass the token as a hidden input field.

Example:

{{ Form::open(['url' => '/submit-form']) }}
    {{ Form::text('username') }}
    <button type="submit">Submit</button>
{{ Form::close() }}

By following these steps, you should be able to solve the '419 Page Expired' error in Laravel forms.