Help installing vimballs

Hi all,
I am trying to install the vim plugin camelcasemotion (which is a vimball) and I received the following errors:
Vimball Archive
extracted <autoload/camelcasemotion.vim>: 173 lines
Error detected while processing function vimball#Vimball:
line  131:
E474: Invalid argument: silent w! ++enc=3 /home1/eran.borovik/.vim/autoload/camelcasemotion.vim
wrote /home1/eran.borovik/.vim/autoload/camelcasemotion.vim
extracted <plugin/camelcasemotion.vim>: 204 lines
E474: Invalid argument: silent w! ++enc=4 /home1/eran.borovik/.vim/plugin/camelcasemotion.vim
wrote /home1/eran.borovik/.vim/plugin/camelcasemotion.vim
extracted <doc/camelcasemotion.txt>: 183 lines
E474: Invalid argument: silent w! ++enc=3 /home1/eran.borovik/.vim/doc/camelcasemotion.txt
wrote /home1/eran.borovik/.vim/doc/camelcasemotion.txt
did helptags

Now I would discard those errors to an issue with this plugin, but this is not the first time I've encountered such issues when installing vimballs.

My setup:
centos 5.4
vim 7.3 (compiled from source using the default options).

Any way to avoid those issues?

Thx,
Eran.

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