"Unable to write in the cache directory" after update to 2.16.0


I get the following error after updating to 2.16.0:

An exception has been thrown during the rendering of a template (“Unable to write in the cache directory (/var/www/piwik/tmp/templates_c/47).”) in “dashboard.twig” at line 23.

How can I fix that?

Hi bit,

Delete /var/www/piwik/tmp/ folder - or give your web server user the permission to write in this folder.