One possible question related to the error "M7020-There is product in the left pressing area when starting machine code of KM-ASSYH3-03 error id of 21" could be:

What does the M7020 error message mean in the context of
The solution for the error described as M7020-"There is product in the left pressing area when starting" is to move any obstructions or product out of the left pressing area of the printer before attempting to start the print job.