I have the same problem.
I have installed xibo in a server previously and it works fine…
Now, after I have migrated xibo to a new server I get the “Fatal Error - sorry this shouldn’t happen. Failed to create cache path.”
Steps done:
changed the cache file permission to webserver user
changed the xibo root file permission to webserver user
restart the webservice
OS is CentOS Linux 7
PHP 7.0.3
Installation type manual non-docker