auto sleep

Hi, I've just found my auto sleep is not working in 10.9.3, after a pmset -g assertions there is a pid 165(com.apple.serve): [0x000000010000012c] -1:-53:-57 PreventUserIdleSystemSleep named: "com.apple.collabd" that is preventing auto sleep but i can't find how to stop it, i've read that...