gulp-usemin TypeError: Path must be a string. Received undefined
问题 I'm using gulp-usemin for minify the javascript files I use in my app, for some reason gulp is not seeing one of my files. I have this in my index.html: <body ng-app="App"> <!--[if lte IE 8]> <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> to improve your experience.</p> <![endif]--> <div> <ui-view></ui-view> </div> <div class="footer"> <div class="container"> <!-- TODO: add fotter here --> </div> <