Error Changing password after logging in

Hi Folks,

after i logged into my acoount with my submitted password i was asked to change the password by entering the project room name, the current password and my new individual password.

After i did so i wanted to continue by pressing enter...the Error "Unable to change password. Please check whether the project room name and your current password are correct." occured. 

Somebody got an idea what to do?

Thanks in advance!