No Shadow & can't mount Problems, Tank Pack

I've recently bought the Tank Pack, but I've got an error with a line

mGenerateShadow = true;

so I commented it, now I dont have any shadow for the tank & I dont know how to add one
and the function mountObject is not implemented in the Tank class, so will it work if I copy paste the function from the original vehicle & add it to the tank ??
(I've got some experience with C++, so just point the way for me & I'll be able to work it out :) )
Thanks in advance