garrys mod prop hunt server problems

iv begain to make my own prop hunt server so me and a couple of friends could play on it. after many hours of google searching and looking around on forums iv fixed alot of the problems that i had so far excpt for these. i searched a could find any info on these two errors. and when i try to login to the server it looks like a have a gravity gun but i cant tell because of the window that covers it and when i try to close it say’s too many lua errors and kicks me off. hope somebody can help me Thank you ,Brendan

Your server is missing CS:S. Check GMod wiki on how to get it.