When I tried to compile my map, a bunch of errors showed up saying I have brushes with no visible faces. There are about 8 or so. It still compiled the map though. But when I tried to load it it said this in the console:

Host_EndGame: Map coordinate extents are too large!!
Check for errors!

So I'd like to know what both of these mean, because all I did before this compile was change a few textures and some other stuff...and how do I fix these?

Can you post the log? Does it say the brushes number? if so, you can locate them to check what's up with them by going in your hammer editor to View > Go to Brush Number.

You can also try to search for problems in your map by going to Map > Check for problems (or hitting Alt+P)... maybe it can detect what's wrong (this is very recommendable to do every once in a while! )

Have you been using the vertex tool or the clipping tool to modify the shape of some brushes? maybe you created invalid brushes.

Yes, it does give me the names of the faces, so I tried looking for them with the overlay's brush face tool, it gives you the face number, but it's going to take much too long.

Check for problems only gives me some things like I haven't filled in some replacement values in instances.

Yes I have been clipping, but it's really weird because I barely did anything between compiles, I applied some textures and collapsed a few instances...

I'll upload the compile later today if you still want it.

Hmmm... I would delete the problematic brushes and recreate them.

Other possibility is that you have mixed tool textures (different than nodraw) and regular textures on the same brush but in different faces. Check this as well.

There's a command in one of the menus to find brush faces using the face number.

Thanks TeamSpen, that will be really helpful for later. However Hammer deleted the "invalid solids" automatically when I loaded the map just now, so it should be fine. It turned out that they were some brushes from an instance I collapsed, but I had checked those beforehand and didn't see anything wrong with them...weird. But thanks anyways.