Matomo down after update

Just out of nowhere motomo login page brought “error Path cannot be empty”
After deleting the content of /matomo/tmp/cache i got another error

Unable to create the cache directory matomo/tmp/templates_c/2e

I googled and there are other people with same error, but no answer to them.
hope s.o. knows what broke!!!

Hi @mbmg
Maybe there is a write access issue. Can you give write access to tmp and all subfolders to the process that runs Matomo?