Hi:
I suspect that there's something about the "Other" by group or group that is incompatible with options or sub-options you have specified. Without looking at your code -- at least the complete invocation statement, that's only a guess.
You might wish to open a track with Tech Support for more complete help. They can look at your data and look at your code and help you find a resolution.
To send a question to Tech Support, go to
http://support.sas.com/ and in the left-hand navigation pane, click on the link entitled "Submit a Problem". Alternately, you can go directly to the Tech Support Problem Form here:
http://support.sas.com/ctx/supportform/createForm
cynthia