I have installed nerdtree using pathogen as per instruction given in the github site.
The packages are located under /vimfiles/bundle as shown below.
/Vim/vimfiles/bundle
$ ls
nerdtree python-mode vim-pathogen-master
I have added the below lines to my _vimrc file
call pathogen#runtime_append_all_bundles()
filetype off
syntax on
filetype plugin indent on
But still when I try using NerdTree I get a not an editor command error. It would be great if you could help me resolve this.