Dart Exception: Already registered (Polymer) prototype for element x

Question

I've two polymer elements that share the same dart file. In the dart file I declare both the PolymerElement classes.

Until polymer 0.15.0+1 it was working fine. I've updated the project to polymer 0.15.1 and now I get this exception:

Exception: Already registered (Polymer) prototype for element x

Where x is the first polymer.

I think the polymer transformer is trying to register it two times, the first scanning the x polymer html file, the second when scanning the other element html file.

An issue has been open in dart: https://code.google.com/p/dart/issues/detail?id=21332

Answer 1

I don't know about Dart and whatnot, but I had the same error message in my console. Turns out I was still having the noscript attribute in my element declaration, which is wrong if you want to register your element manually. Removing noscript from the element declaration solved the problem.