Ok, this is an odd, and deadly error. Basically, the map will compile fine. When you attempt to run the map, everything seems great, however before it loads, it crashes back to the main screen. When you press the console button, all it says is this:

Host_Error: PF_precache_model_I: Bad string"

Now, I am guessing it's an entity problem, (dur), but being more specific is starting to be a little more difficult. This is what good o'l Tommy says:

Host_Error: Bad String

This rare error only happens in game/server mode when sprites, models, sounds, or text strings (but not all strings!) are initialized and precached. If the string/name for the sprite, model, sound, or miscellaneous text string either starts with a non-printable ASCII character, or is 0 length (ie: starts with a non-printable null ASCII character), then the error will occur.
Solution: search thru entities like env_glow, env_sprite, ambient_generic, env_shooter, etc. - anything the engine has to precache a file for the bad name.

This is a svencoop map which uses a ton of custom sounds, and models. Now, the odd thing is that it says it's a naming problem. However, when I do entity check, and even ripent the bsp, I can't find any problems with any of the characters!

Somebody, please shed some light on my problem, or offer to lend me a hand! I already have two people trying to find the problem. The faster it is solved, the faster my map can be completed.

If I get any more information, or find a fix for it, I'll put it up.