When booting VIM: Errors E121: Undefined variable: VundleInstalled & E15: Invalid expression: VundleInstalled == 1

I’ve tried StackOverflow and Quora to find a solution to this error. It doesn’t seem to be affecting usability at all but it pops up every time I open VIM:

E121: Undefined variable: VundleInstalled │ E15: Invalid expression: VundleInstalled == 1

I checked my ~/.vimrc as well as the file in ~/.vim/bundle to ensure the case matches in all the files referencing Vundle but it still throws the error.

Here’s my ~/.vimrc file:

1 set number                                                                                        
2 set nocompatible
3 filetype off
4
5 syntax on
6 colorscheme Tomorrow-Night
7
8 set rtp+=~/.vim/bundle/vundle.vim
9 call vundle#begin()
10
11 Plugin 'VundleVim/Vundle.vim'
12 Plugin 'tpope/vim-fugitive'
13 Plugin 'wincent/command-t'
14 Plugin 'rstacruz/sparkup', {'rtp': 'vim/'}
15 Plugin 'vim-scripts/L9', {'name': 'newL9'}
16 Plugin 'tpope/vim-rails' 
17 Plugin 'tpope/vim-rake'
18 Plugin 'tpope/vim-bundler'
19 
20 " Color Schemes
21 Plugin 'chriskempson/tomorrow-theme'
22 Plugin 'flazz/vim-colorschemes'                                                                  │
24 Plugin 'chriskempson/base16-vim'                                                                 │
25                                                                                                  │
26 call vundle#end()

Any insight into the issue would be greatly appreciated.

Hmm, that is odd. You might try updating your vundle install

$ cd ~/.vim/bundle/vundle.vim
$ git pull

You could also try grepping for that variable in your bundles:

$ cd ~/.vim/bundle
$ grep VundelInstalled

Give those a shot and see if they help clear things up.