How to solve symfony error variable "expanded" does not exist?

@gilbert 

To solve the "variable 'expanded' does not exist" error in Symfony, follow these steps:

1. Check the variable name: Verify whether the variable name mentioned in the error message (i.e., 'expanded') exists in the appropriate file or not.
2. Check template file: If the error is related to a template, go to the corresponding template file and ensure that the variable 'expanded' is correctly declared and passed to the template.
3. Check controller action: If the error is related to a controller action, inspect the associated controller method. Ensure that the 'expanded' variable is properly defined and initialized in the action and then passed to the template via the render function.
4. Clear the Symfony cache: After making any changes in your code, clear the Symfony cache by running the command php bin/console cache:clear in your Symfony project root directory. This step ensures that the updated code is reflected correctly.
5. Check for typos or syntax errors: Double-check for any typos or syntax errors in the code that could be causing the 'variable not found' error. Pay close attention to variable names, as case sensitivity might be an issue.
6. Review Symfony version: If you are following a tutorial or using code from an older Symfony version, there may be differences in variable names or declaration methods. Make sure you are using the correct version of Symfony and check the official Symfony documentation for any differences.

By following these steps, you should be able to resolve the "variable 'expanded' does not exist" error in Symfony.