MS Word plugin doesn't work when clicking Connect button

So i was using MS Word plugin some time and it worked perfectly. 

One day i tried clicking Connect inside Word and i had this error message :



'.', hexadecimal value 0x00, is an invalid character. Line 1,position 1.



Tried updating Net, uninstalling and installing older/newer version of MS word plugin. Nothing helped. 



Any ideas? 



Thanks!