Recently, I have installed a new jQuery plugin (jQuery Masked Input Plugin by Josh Bush) to my application. I’d noticed that my existing masking functionality, that I’d already had in place, was broken somehow. Later, I found that there was a name conflict between my existing plugin and the new jQuery Masked Input Plugin that I had installed. Both plugins had the same name function “mask." In this article, we will see how we can solve it. Problem: Error Due to jQuery Plugins With Conflicting Names custom-extensions.js: has a mask function.