Why is dishwasher not fully drained of water?

Built in De Dietrich 2011 model dishwasher. I took out the plastic white dirt filter,put it in the cutlery box and put dishwasher on boost with a tablet to try to clean the machine and the plastic filter.

Fault code D02 and some water left in bottom/not fully drained.

Could this be because I removed the dirt filter and is it likely the machine will start up if I put it on a normal cycle replacing the plastic filter