@bsd70 just a note of caution about discussing exam materials in public forums - It is a violation of the candidate agreement. You haven't crossed the line but you are close. Specific exam concerns should be addressed to certification@sas.com via email.
That being said, I assure you that your input data folder contained the data sets (I checked your lab as you tested recently and the data is still there). Given that all exam labs are simply copied from a master template virtual machine at the start of your exam, there is 0 chance that corruption in the template could result in the data being missing. It's possible if the bits got scrambled in the copy that the entire lab would not work (though I've never seen this occur), but no-way could there be missing files.
Trust that your SAS is executing your code exactly as you have written it, and if it's not working right, the problem is the code. It's like a magic genie. If you tell it "Make me a peanut butter sandwich", don't be upset when you are suddenly turned into a PB sandwich. This takes a combination of humility to accept that the code isn't right and confidence that you have the skills to fix it. It is possible that your code was syntactically correct and produced no errors, but was logically wrong. You may have used one libname in your LIBNAME statement and another in your PROC SORT. And a note on PROC SORT: It is important to understand where the sorted data is created by default without any additional options. The A00-231 Exam Content Guide is your friend here.
Best of luck in your exam preparations.
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