I keep trying to go onto The Claptastic Voyage DLC but it keeps saying i dont own it, but i do!

whenever i try to go to Bay 3 1/2 or whatever its called, it says i dont own it, which i do! i have both part, and it wont let me fast travel there.

Uninstall and reinstall the DLC is my best bet. Only other thing that comes to mind is 3rd party software no-nos on your save file and it goofed up bad.