CrimsonVengeance

I'm a noob, so pardon me if the error is easy to fix. Whenever I try to decimate a part of my model, it says "Unable to write file: Temp/id19990/Cache/new_head:hair_render5:brush8Main_5564606.volume" I know I need to add my system info, but I have no idea how to do that for 3dcoat. I've been trying to fix this for over 8 hours so please and thank you for whoever decides to help.