The email is being sent to allow you a chance to review.
In some cases a failure notice is not a bad thing.
Please be sure to review the content and transactions.
You'll also want to login to RentPayment directly, and review the tranactions and relevent import or export.
It may be that you will be able to self correct and possibly resync an import or resent an export as appropriate.
In some cases, leaving the failed import or export in place and making a manual update to your software is the right call.
If you have question - please contact the Account Management team at AccountManagement@RentPayment.com so we can help you out.