[SOLVED] Error: "FatalErrorException in ErrorHandler.php line 48: " in Prestashop 1.7.1.2

[metal1616]

 Hi, when I went to change logo of the template, I've selected the image and when I clicked "Save", this error appeared in the screen:

Whoops, looks like something went wrong.

1/1
FatalErrorException in ErrorHandler.php line 48:
Compile Error: Cannot redeclare class Symfony\Component\Debug\ErrorHandler
in ErrorHandler.php line 48

Now I can't enter to the backoffice, ever shows me this error.

someone knows what I can do?.

 

 

Thank you in advance.

 

EDIT: 

I solved following this post: https://www.prestashop.com/forums/topic/594434-error-fatalerrorexception-in-classesphp-line-1723/?p=2516477

Edited July 12, 2017 by metal1616 (see edit history)