In case anyone else has / had the same issues with the webpanel, at least the one I used from "theChaosCoder", this is what helped me. I got that from a reply on his end on Github.
Code:
It's a configuration problem on your end. You need to allow write permission for the folder /cache/SQL.
Code:
There are many tuts out there for this.
But for a quick test you could try to change the cache location
From
FileSystemCache::$cacheDir = $dir.'/../cache';
To
FileSystemCache::$cacheDir = '/tmp/player_analytics';
in app.php
https://github.com/theChaosCoder/player_analytics/blob/master/inc/app.php#L34
He replied twice on my issues, you see both replies above. For me, the first solution did it. Just in case more having the same issue.