I'm trying to merge Cloak01 from the druid model into my own model. But everytime I tried to export, there's an error message of a vertex not having the proper weight.

Can someone help me out and explain it to me what went wrong and how to fix it? Thank you in advance!!

Here are some screenshots of the models I'm working on btw:
http://www.studiocyen.net/badmojo/go...r_spearman.jpg
http://www.studiocyen.net/badmojo/go..._swordsman.jpg
http://www.studiocyen.net/badmojo/go...or_knights.jpg
http://www.studiocyen.net/badmojo/go...lry_charge.jpg
http://www.studiocyen.net/badmojo/go...ers_ambush.jpg
http://www.studiocyen.net/badmojo/go...ers_volley.jpg
http://www.studiocyen.net/badmojo/go...gers_sword.jpg