I got this error while I'm testing out my new map.I'm not corncerned that I did not do anything wrong to the map or tags.Could someone help me out?

as aLTis already said, it can happen for a few reasons.

for example:
wrong team index or none on teams, you may have added grenades to the starting equipment or
you went over the limit and used tool lame, sorry i mean pro. :)
or you only have 1 slayer spawn to test the map with, but have placed something on top of the spawn.
if it's grenades just add them the same way you do for a item_collection when you place weapons.
Edited by ally on Sep 8, 2012 at 05:21 AM

Yes, remove the grenades from the starting equipment and or add the gametype flags that are required by the gametype you are trying to play.

where do I find the gametype flags or the grenades from the starting equipment?

when you open your maps .scenario scroll down to roughly the middle and there if you added grenades in the starting equipment you should see it. if you don't know where it is then you couldn't have added them.

check the game flags by opening the .scenario in sapien.

Ally is right.
Did you try to run the map on any gametype other than slayer? or did you try to play the map with more players than spawn points?
You only need to add netgame flags if you are using a different gametype than slayer.
Try your map with just 2 spawn points ( one for 0 and one for 1, team index), when starting game make sure you have it to just slayer and 2 players max.