Help with IBL Captures

Soo my map is basicly done.
All its missing is the IBL captures, but somehow i cant get them to work. They are all black and wont work.
They are missing the snapshots but i cannot add them?

Anybody knows how to make the IBL captures work?

Ive got night and day working + having all the rest working. Just not the IBLCapture/s. Since no snapshots are linked to the masterIBL’s. And i cant add them.