I am getting this error in the Google chrome developer console.
Failed to parse SourceMap: http://localhost:15132/Scripts/_External/igniteui/css/the
When I had this issue the cause was a relative reference to template files when using the ui.bootstrap.modal module.
templateUrl: 'js/templates/modal.html'
This works from a root domain (www.example.com) but when a path is added (www.example.com/path/) the reference breaks. The answer in my case was simply to making the reference absolute (js/ -> /js/).
templateUrl: '/js/templates/modal.html'