AngularJS multiple expressions concatenating in interpolation with a URL

Question

I know this is long, but please bear with me. The problem is easy to understand, just takes some writing to fully explain it.

Right now I\'m getting this error

Answer 1

My version is angular.min.1.5.8.js I had the same issue with a form. I resolved it by changing the attribute action=URL by ng-action=URL.