I had that same error with 3ds max 9 and bluestreak What was happening was I had a object that didnt have a bitmap set to it. It had no material on it. Take and do this in 3ds max. click file, Reset now click Merge and find your 3ds max file with the level/weapon/scenery what ever it is you have. merge it into your reset scene now click material and find a bitmap you have and apply it to everything then export it. should work then.