Unable to get property 'Gallery' of undefined or null reference

I'm getting this error in Internet Explorer:

Unhandled exception at line 1, column 106 in http://localhost:50981/Scripts/bootstrap-image-gallery.min.js

0x800a138f - JavaScript runtime error: Unable to get property 'Gallery' of undefined or null reference

I am using bootstrap and blue imp gallery in my website project.

I've tried reordering script links to no avail.

How can I fix these errors?