Oh ok, but it is looking for mp_beach.bsp it is saying after i click start server, and bring the console down, it says something like, "maps maps/mp_beach.bsp" was not found.
The waypoint for mp_beach was posted for someone that was having texture issues with et_beach. The maps are exactly the same I just renamed the files for et_beach to mp_beach.
I recommend just using et_beach the map can be downloaded from here...