This rejection suggests that you haven't completed the attachments and questions 80, 85 and 90 correctly.

On the CT600 if you click file / attachments you need to check what is showing here and amend accordingly. On page 2 of the return you need to then cross the applicable boxes at questions 80 and 85 relating to the accounts and / or computations that are attached.

If you haven't attached either the accounts and / or computation you will need to give the reason at question 90. This is split into two rows, the first drop down menu is the reason why accounts have not been attached, the second drop down menu is the reason why the computations have not been attached.