Error when running example in Firefox

[wilcraig]

Error: Invalid isolate scope definition for directive chart: =? $CompileProvider/this.$get</applyDirectivesToNode/nodeLinkFn/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:4196 forEach@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:117 nodeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:4142 compositeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3848 compositeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3854 publicLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3763 update@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:13890 $RootScopeProvider/this.$get</Scope.prototype.$broadcast@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:8090 $RouteProvider/this.$get</updateRoute/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7250 qFactory/defer/deferred.promise.then/wrappedCallback@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6650 qFactory/defer/deferred.promise.then/wrappedCallback@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6650 qFactory/ref/<.then/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6687 $RootScopeProvider/this.$get</Scope.prototype.$eval@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7840 $RootScopeProvider/this.$get</Scope.prototype.$digest@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7707 $RootScopeProvider/this.$get</Scope.prototype.$apply@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7926 done@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:8933 completeRequest@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:9073 createHttpBackend/</xhr.onreadystatechange@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:9044

https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js Line 5582