Just installed, getting an error on run

[jwaltrip4]

I run the script

/opt/plexupdate$ sudo bash plexupdate.sh
warning: Not a git repository. Use --no-index to compare two paths outside a working tree
usage: git diff --no-index []
====== lots of option info
====== then:
WARNING: You have made changes to the plexupdate files, cannot auto update
Retrieving list of available distributions
Your OS reports the latest version of Plex (1.26.2.5797-5bd057d2b) is already installed. Use -f to force download.

Looks lit is is working, but the git update stuff does not work