GW 2014 Client Options: unable to get the object.

Hello,

we have following problem:
I go to a user than i click on Client Options.
I get following failure: Unable to get the object. See error log for more details.


Can somebody tell me, where i can find this log file?

Our GW 2014 R2 Administration Version: 125534, Revision: 14.2.1

Thanks.