It didn't work, had the same error.
Hmm...Okay try this once you've loaded all of the plugins you want resources from:
1. Find the model path of each object you want to use, as shown http://img689.imageshack.us/img689/8327/csmodeltab.jpg.
2. Now right click in the category it needs to be added to (i,e. for containers, click in the Container list) and select "New".
http://img689.imageshack.us/img689/8317/csnewobjectwidow.jpg should pop up.
3. Put a new RefID in the ID box (like MyNewObject01 or something).
4. Click on "Add NIF File" and go through the folders outlined in the model path you looked at in step 1.
5. Select the .NIF and click "OK".
This method is a bit tedious, but it should get you all the models (one by one) that you want to use.