Was this solved after your other issue was fixed?
If not, let's go back to the admin web console-at least your getting an error # then.
https://mail.friestedt.com:7071/zimbraAdmin/?debug=1&gzip=false&mode=mjsf
A debug window should open up-then do the action again and paste us the output here.
(If more output is needed - increase the debug level to 2 and eventually 3)