If splitting pension income with spouse with amount on line 21000 the  net income on line 23600 is less then net income on and then error happens? Line 23400 is Net income before adjustment so higher ... then the error happens?

This has been a persistent error over several years with TurboTax Canada. I am receiving the error right now. 

Can confirm that this worked for me, too. Thank you!

Yes, this solution from "Bebeforreal" works: 

This worked - I phoned their customer care department twice and they are absolutely useless! They don't have a clue what is going on and don't seem to think this is an urgent issue....mess!