We're sorry, the Canada Revenue Agency was unable to accept your NETFILE tax return.

Despite trying several times, I am prompted with this message when trying to submit my personal tax return through NETFILE. I have verified all information countless times now and yet I am still prompted with:

 

"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 Developer."

 

I still have no idea what information is incorrect or missing, as no specific indications are given in this regard. Any advice is much appreciated.