Not able to load up any rigs in 3ds Max 2012

[GremlinSleeperAgent]

Like the title says I can't seem to manage to load up anybody's rigs in 3ds max. Yes, I have HCT. And I should have niftools installed correctly. Despite this, when I go to load a rig, be it one of Babo's, Billy's, Leito's, ect., nothing happens. I do this via import and then merging the rig with an empty/new file.

 

If I try to open the rig directly it then it gives me this error;

 

 

And nothing else. 

 

Thanks in advance for any help, and have a good day!