can't call in care package in mp[SOLVED]

[WarpSpider]

I made a mp map and everything seemed to be good. Then i got a care package and no surfaces would let me mark the location...
I just started learning how it all works and I'm stumped about this. I don't know what "umbra" is so I thought maybe has to do with that, but I'm too tired to search for an answer anymore.
Does anyone know about this?

[WarpSpider]

This is the warning I get everytime I compile:

WARNING: NavVolume generation is skipped. Flying units might not behave correctly. This might be due to there is no nav_volume brush in the level, or the generation is skipped purposely by skipping -navvolume option.

Does anybody know what I need to do? Talon doesn't work either, but UAV, sentry gun works...some air-based scorestreaks aren't working for me...

[>:FrozenDragon:<]

You might need special triggers for them to work properly i only use the tools to make zombie maps so i don't really know anything about multiplayer map making but like i said you might needa special trigger.

[WarpSpider]

Yeah probably a texture that would go on the ground. Hopefully somebody can post how it works here before I have to search the whole internet and watch hours of tutorials...I think I'll just play around with triggers and build a bit before I ever figure it out...

[WarpSpider]

I put a nav volume brush and that fixed the error, but the care package and other scorestreaks still don't work...

[WarpSpider]

All scorestreaks now are working, thanks to a prefab I downloaded from http://steamcommunity.com/id/MakeCentsdg
Can be found here--> https://sites.google.com/site/makecentsgaming/home/bo3-tutorials/mp-template