Netfile Error: Specify the employment income you want to claim employment expenses on. I have answered “Yes” to the question “Will you claim…” on my T4.

Netfile Error: Specify the employment income you want to claim employment expenses on for working at home due to COVID-19.
I have answered “Yes” to the question “Will you claim employment expenses…” at the bottom of the page of my T4, but I keep getting this error at the time of submission.