Please contact technical support and provide your code (and data). The traceback helps. Seeing your code helps more. Also, provide the number of observations in the data set and the levels in your STRATA statement.
These exception errors in my experience fall into 3 classes
1) requesting a combination of options that don't make real world sense and that the programmers at SAS didn't provide a check for because "no one will ever do that"
2) pathological data. This means data for a specific purpose that misbehaves. The specific analysis and data determines what that may be. I suspect that is why @StatsMan asked for the number of levels for the strata variable. Many levels may make it harder to deal with.
3) System problems. This can be anything from bad installation media so one program file is corrupted (I had this happen so that the DATA step wouldn't run once), or something relying on external SAS files is incompatible such as Java, Microsoft Office (32 vs 64 bit can still be an issue) or similar.
But diagnosing almost anything like this is a tech support issue.
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