Why am I Getting a Type 13 Error?
A Type 13 error is usually due to this issue. It could be something else. It is generally non-harmful and you're able to run your reports and work with your directory even though you may have to click the OK button a few times to get past the error notifications.
If you would like to resolve this issue and are experiencing it in the Religious Education module, then you will need to make sure that you have a Birth Date and a Grad Year for each of the students in your student directory. The error should then go away.