Both Fields Must Be Filled on Home Office Expenses page

[m_thy]

I am getting this message about the Home Office Expenses page:

Both fields must be filled.

This error prevents tax calculations. Click here to fix.

 

This is preventing me from doing the review and calculation and submitting my return.

 

All fields are filled on this page. The message is frustratingly vague.

[jdoubleyou]

Did you find a solution? I am getting the same vague message on a T4A page - box 135 - premiums for health services