: include(C:\xampp\htdocs\***\***\***): failed to open stream: Permission denied

Sounds like it explains itself, check your folder storage permissions.

storage permissions?where is it?

Well you didn't show the whole error message so I'm not sure where you are having trouble but any folder that needs write permissions.

I would say show more of the error so people can help.

Have you moved the files from one windows installation to another? If so your username might not have the same user id. You can go through diretory by directory but that will take some time and might not help.

I suggest you copy paste the files you have updated into a new project. If you are not using git that is or some other version control system.

This is error message:

ErrorException : include(C:\xampp\htdocs\PHP\xxx\xxx): failed to open stream: Permission denied

at C:\xampp\htdocs\PHP\xxx\xxx\vendor\composer\ClassLoader.php:444 440| * Prevents access to $this/self from included files. 441| */ 442| function includeFile($file) 443| {

444| include $file; 445| } 446|

Exception trace:

1 include() C:\xampp\htdocs\PHP\xxx\xxx\vendor\composer\ClassLoader.php:444

2 Composer\Autoload\includeFile("C:\xampp\htdocs\PHP\xxx\xxx\vendor\composer/../..") C:\xampp\htdocs\PHP\xxx\xxx\vendor\composer\ClassLoader.php:322

Please use the argument -v to see more details.