As we do not know the exact error you are getting please see if this solution helps.
Ensure that you've matched up the box with the number of months entered to the proper type of income.
Box 23 is how many months you received the amounts in Box 14 - retirement income. Box 21 is how many months your received the amounts in Box 16 - disability benefit. Please see the image below.
As per reaching the telephone support team, when you hear the message asking if you wish to receive an email say NO then say "speak to a representative" and hold the line.
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