SaveDevice PC cannot open file for saving

Hello,
I have edited some files and also created new ones for a server of Counter Strike. Today when I tried to open the new files and save them this ERROR popped up. I think I might lost all the work I have done and I would like to know if there is a solution for this error? What are the chances that all files are lost? Thank you experts!

ERROR
SaveDevice_PC-TempSaveGame:cannot open file for saving
EXIT
