Default [Q] ROM flashing failed

Hello, I have been trying to flash different roms to my xt901. CM 10.2...unofficial is the only one I can get to work on the phone. Every other rom I tried makes TWRP 2.6.3.0 say, "
E:Unknown File System: 'datamedia'
Updating Partition details...
Installing '/external_sd/(my rom)
Checking for MD5file...
Skipping MD5 check: no MD5 file found
Error flashing zip '/external_sd/(my rom)
"