Perspective view black and Failed to create entry point

I was making a smooth teleport while all of a sudden the perspective view became all black.
I tried possesing the player and start but it said failed to create entry point.
Every other viewport type works:Top, Front, sides and i can posses the player in those but i cant in the perspective one.
I searched for other people having the same problem but i couldnt find a solution.
Any help?

if its only project specific problem - you can remove Saved and Intermediate folders to reset its configuration.