date.js

              controller.$validators.uiDateValidator = function uiDateValidator(modelValue, viewValue) {
                return angular.isDate(uiDateConverter.stringToDate(attrs.uiDateFormat, viewValue));
              };

error.txt

TypeError: Cannot set property 'uiDateValidator' of undefined
    at Object.initDateWidget [as fn] (date.js:145)
    at Scope.$digest (angular.js:12543)
    at Scope.$apply (angular.js:12808)
    at done (angular.js:8381)
    at completeRequest (angular.js:8595)
    at XMLHttpRequest.xhr.onreadystatechange (angular.js:8534)