This same error message has been bedevilling me. I never get it the first time I run a program. But at some point, when I return to a program and re-run it, SAS (EG) gets it into its brain that I am creating a long character string. I can't figure it out. And the only thing that works is to exit EG entirely and then restart the application -- painful when you are 3/4 of the way into a long process. I think I most often experience this when I am calling a macro from another program with the "include" statement.
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