I tested my pluign with all others disabled and worked fine, as you can see in the PM. Then I re enabled all, not working.
I narrowed it down to Clubs Enhancements you're using, which is an outdated version (1.1.2). This version is for IPS 4.3, not 4.4. There were some changes in a class that CE and my plugin extends, so CE is broking the class.
You should disable CE or update it.