Twig Problem

Hello ,

i get this error notice :

Twig_Error_Runtime
An exception has been thrown during the rendering of a template ("The cache/gpm folder is not writable. Please check the folder permissions.") in "partials/themes-list.html.twig" at line 21.

The only thing i done is installed the Admin Plugin. When i logged in and click on the left site on "Plugins" or " Themes i see this .
When I click on settings, its all fine .

As the error says, it's a permissions issue. The webserver can't write to the cache folder. check the docs on permissions troubleshooting