Hello Anna Keitshoketse Nchoke 

Your error could be caused by a variety of reasons

We've listed a variety of solutions in our KB article: Validation Error: "Income for previous tax year, no assessment year given"

If my answer does help, please click on Verify answer.

Sharon

Hello Anna Keitshoketse Nchoke 

Your error could be caused by a variety of reasons

We've listed a variety of solutions in our KB article: Validation Error: "Income for previous tax year, no assessment year given"

If my answer does help, please click on Verify answer.

Sharon