Bower.js - throws unpredictable error

In my app, I am using bower_components for all my lib files. it works all fine. But I am keep getting a error from the bower_componets saying:

`Uncaught SyntaxError: Unexpected token <'

What is this mean? what is wrong with my configuration. how to solve this?

Here is the error screen shot

if any one require more details, let me know...

please help me to solve.