i need help oculus vr not working in preview

i used the vr template which works perfectly but when i use vr preview on my own map the screen just goes black. is the map too big? did i forget something? i literally put the vr template up to my own map and everything seems the same i dont see a issue.
thx in advanced

this is not enough information at all to help you. make sure you added the vr pawn to that level etc. some screenshots will help