These kind of errors usually depends on corrupt data.
Since it's a work table, just try to restart your SAS session.
If that doesn't help (you'l get the same error), you need to find the program/function that creates this data set.
Don't be so sure about that @Reeza, I had similar problem on a few occasions. corrupted data or libnames with paths or options that weren't valid. See another thread of the subject (even though I don't think the solution there doesn't apply here?)
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