AddFile ín Frontend does not work

[MariusHerget]

When adding a file in the frontend the following error appears:

TypeError: c[d] is undefined[Learn More]  dropzone.min.js:1:1418
	c.prototype.emit http://localhost:3000/bower_components/dropzone/downloads/dropzone.min.js:1:1418
	b</b.prototype.addFile http://localhost:3000/bower_components/dropzone/downloads/dropzone.min.js:1:19292
	b</b.prototype.init/d</</< http://localhost:3000/bower_components/dropzone/downloads/dropzone.min.js:1:12321

System: Angular: 1.5.9 jQuery: 3.1.1 angular-dropzone: ^0.1.2

Compiling with gulp, but all mentioned files are included.