This prompt indicates a conflict with the test restrictions set up by your district. The prompt explains the reason—for example, the test frequency may be limited to once per testing term.
In some cases, you may have the Resume Test option, which continues the suspended test.
Otherwise, choose Start New Test (which starts the test over from question 1) or Do Not Confirm (which disallows the student from taking the test again this term). (Cancel will close this prompt but that's all). You may need to assign a different test for the student. Or, contact a leader in charge of MAP assessments (he or she may need to temporarily adjust the test restrictions).