"Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: menu in menus, Duplicate key: string:

http://errors.angularjs.org/1.2.15/ngRepeat/dupes?p0=menu%20in%20menus&p1=string%3A%0A
minErr/<@http://127.0.0.1:8000/static/angular.js:78:12
ngRepeatAction@http://127.0.0.1:8000/static/angular.js:19729:20
$watchCollectionAction@http://127.0.0.1:8000/static/angular.js:11908:13
$RootScopeProvider/this.$get</Scope.prototype.$digest@http:   //127.0.0.1:8000/static/angular.js:12031:23
$RootScopeProvider/this.$get</Scope.prototype.$apply@http://127.0.0.1:8000/static/angular.js:12279:13
done@http://127.0.0.1:8000/static/angular.js:7991:34
completeRequest@http://127.0.0.1:8000/static/angular.js:8196:7
createHttpBackend/</xhr.onreadystatechange@http://127.0.0.1:8000/static/angular.js:8137:1"