According to SAS Tech Support - this is a common issue with SAS 5.1. For those of you scratching your head with this issue as well - All you have to do is apply the hot fixes to make this error message go away. I've included it's link, below, as an FYI: http://ftp.sas.com/techsup/download/hotfix/HF2/G35.html#G35011
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