Error Code O020 means that the roster dates do not align with the student's enrollment. The student's roster dates pre-date or post-date their enrollment dates. Or there isn't an enrollment record included in the enrollment.txt file. The best way to point you in the right direction is to open both the enrollment.txt and roster.txt files and look at the Entry Dates for both of them. Updating the student roster dates or enrollment dates should resolve this error.
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