vim 7.2 on SUNOS10 and nerdtree

Dear all,

I am new with vim plugins.
I just have downloaded the nerdtree one from its git repository onto a ~/.vim/plugin directory.
Then, I have moved the NERD_tree.vim file from the ~/.vim/plugin/nerdtree-master directory up to ~/.vim/plugin.

When launching vim I have the following errors :
Error detected while processing ~/.vim/plugin/NERD_tree.vim:
line 68:
E117: Unknown function: nerdtree#runningWindows
E116: Invalid arguments for function <SNR>6_initVariable
line 94:
E117: Unknown function: nerdtree#runningWindows

I think I have missed something when installing, isn't it ?

Thanks for your help

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