Hi:
Searching support.sas.com for that particular error message results in this hit, which seems especially relevant: http://support.sas.com/kb/32/412.html
You should open a ticket with TS to get information on a 4.2 hotfix. Essentially, the hotfix will add the 'NWAY' option to the PROC SUMMARY code that runs in the background.
Another option is to use SAS Stored Process output that uses the PROC SUMMARY NWAY code.