"This map does not have a slot for a human participant" error

I was trying to create a simple map using ScmDraft 2, but everytime I try to run the map on Starcraft, I always get the same error that says “This map does not have a slot for a human participant”. The thing is, I already added a human slot for player one on that map. Furthermore, one of the maps I created a year ago using Staredit didn’t have this issue, despite the player slots looking exactly the same as the map I just created recently. In fact, when I edited the map using ScmDraft 2, it worked perfectly fine. It also had a human slot too. Why is Starcraft not accepting my new map?

Make sure the human player has a start location.

Make sure that Start Location is positioned at Map.