Generally means it's a good idea to call SAS tech support (it's free!)
You can try starting a fresh session (quit Enterprise Guide, then reopen it and reconnect to the server) to see if the problem repeats.
You didn't show your DATA step code that caused this error, can you post the log showing the data step and the error message? That might help point to some possibilities.
The Boston Area SAS Users Group (BASUG) is hosting our
in person SAS Blowout on Oct 18!
This full-day event in Cambridge, Mass features four presenters from SAS, presenting on a range of SAS 9 programming topics. Pre-registration by Oct 15 is required.
Full details and registration info at
https://www.basug.org/events.