Hello. I have a few texture errors on walls. I have downloaded the map and zarp content but i still have errors. Also i cant see textscreens. I have css and half life content addons installed. What should i do?

Hello. I have a few texture errors on walls. I have downloaded the map and zarp content but i still have errors. Also i cant see textscreens. I have css and half life content addons installed. What should i do?