Understand Migration Errors
Whenever the migration tool finds an error, it's presented in a table along with an explanation, the list where it's found and the exact record where you can find the error.
Once you correct the error, run the tool again. Each time you find and correct an error, that becomes a line item in the log shown above the table.
*To learn more about how to correct error messages, please read our Correct Migration Errors article.