Can't run maps[NEW INFO]
I have run maps before but now I cant. but only if I make new maps.If I load an old map that would run then edit it and overwrite the save then I can run it but if I make a new map from scratch and save it it wont run.
in the launcher screen it says entity [entity name] Leaked!
then at the bottom it says
LoadPortals: Couldn't load [map file location]
the weird thing is that at the end of the [cant load file] it says the file is in a .prt format but I saved it as a .vmf because that is the only choice I have for what to save it as.
new info: I looked through my files. on the map that I can run there is a .prt file. there isnt one for the maps I make now. but heres another thing. there is a .lin file for the newer ones but no .lin file for the older one.
I think I may have solved it. All I did was add the rest of the walls and a ceiling so it was completely covered and now it works.
NO. You never ever ever cover your map in a box, and that's what it sounds like you're doing.
If, however, you simply meant you closed a room that was previously open to the void, then sorry; I just had to make sure I'd drilled that down your throat. Now then, I'd recommend you look at the page on the VDC discussing leaks; it doesn't sound like you're too familiar with them, and you should be; they're you BEST friend. Not. Also, the .prt file is something completely separate from the .vmf file; don't worry about it too much.
yea I didnt know that I couldnt have any part of the map partially open. my map had a wall missing and no ceiling cuz it was basically just for testing purposes at that point
Just make sure your room is closed but DON"T build a big box AROUND your level 
what do you mean by not build a box around it. are you saying like do not make a giant hollow box around the entire map but still having some open rooms?
Yes, we are; you must NEVER do that. It causes all the problems a leak causes but without the leak itself.
exactly what problems do leaks cause? just being able to trap your player because if you fall there is no way back up?
I think in terms of boolean variables. Generally, it makes things easier.