This is an old thread but I had the same problem and managed to fix it.
I was using Robes for Korriban Sith Students. The mod uses TSL patcher but it doesn't install all of the necessary files.
Instructions: Use the TSL Patcher make the changes to the appearance.2da file and put the rest of
the files manually into the override folder and enjoy the mod!
I copied all of the files from the 'For Override' folder in the 7z file to Override and Vek showed up and the game didn't crash.
I hope this is helpful to anyone else who runs into this problem in the future.