How to fix Angular 2 `Uncaught (in promise): TypeError: Cannot read property 'query' of null`?

Question

I\'ve been using the Heroes tutorial in the Angular 2 docs to experiment. However, I\'ve come to a point that I don\'t understand what\'s happening with this error:

Answer 1

In the "tsconfig.json" set "emitDecoratorMetadata" parameter of the "compilerOptions" section to the "true" value.