Stacktrace dart2js angular2

gistfile1.txt

Uncaught Uncaught Error: Invalid argument(s): "if" is not a valid (qualified) symbol name
Stack Trace:
Invalid argument(s): "if" is not a valid (qualified) symbol name
    at dart.wrapException (http://localhost:8080/main.dart.js:3963:15)
    at dart.Symbol.static.Symbol_validatePublicSymbol (http://localhost:8080/main.dart.js:23890:17)
    at ReflectionCapabilities.dart.ReflectionCapabilities.setter$1 (http://localhost:8080/main.dart.js:88474:73)
    at Reflector.dart.Reflector.setter$1 (http://localhost:8080/main.dart.js:17865:44)
    at dart.setterFactory (http://localhost:8080/main.dart.js:20891:71)
    at ElementBinderBuilder.dart.ElementBinderBuilder.bindProperty$2 (http://localhost:8080/main.dart.js:21228:53)
    at ViewSplitter.dart.ViewSplitter._parseTemplateBindings$2 (http://localhost:8080/main.dart.js:19284:44)
    at ViewSplitter.dart.ViewSplitter.process$3 (http://localhost:8080/main.dart.js:19251:16)
    at CompileControl.dart.CompileControl.internalProcess$4 (http://localhost:8080/main.dart.js:18096:14)
    at CompilePipeline.<anonymous> (http://localhost:8080/main.dart.js:18256:60)