Here is the full message from CRA: One or more entries in your tax return require correction. The data entered is either invalid, or mandatory information is missing. If you are unable to resolve the issues, please contact your software provider.

Would be very helpful if you could advise which entries. The spousal return was submitted without problems and this is the 3rd year we have used the product. Please advise what steps I can take it identify the issue as your review is indicating all is correct