I am using macvim Version 8.0.1098 (137) MacOS Sierra 10.12.6. I downloaded NerdTree tabs from [here](https://github.com/jistr/vim-nerdtree-tabs). I am using pathogen to manage my plugins. All the plugins work except this one. This is the error message I get when I type the command

```
:NERDTreeTabsToggle

```

I get the error

```
Error detected while processing function <SNR>27_NERDTreeToggleAllTabs[7]..<SNR>27_NERDTreeOpenAllTabs[5]..<SNR>27_NERDTreeMirrorOrCreate:
line    7:
E464: Ambiguous use of user-defined command:     silent NERDTreeMirror
line   12:
E492: Not an editor command:       silent NERDTreeToggle 

```

Now if I install the simple NerdTree it seems to work totally fine. Any suggestions on how I can figure out what I might be doing wrong here?

Also when I open macvim now I get the error at the bottom which is

[![enter image description here](https://i.stack.imgur.com/pdVAq.png)](https://i.stack.imgur.com/pdVAq.png)