$modal.open({
        template: '<div class="modal-body">Choose current project<button class="btn btn-primary" ng-click="ok()">OK</button> <button class="btn btn-warning" ng-click="cancel()">Cancel</button></div>',
        controller: ModalChooseProjectCtrl
    });

var ModalChooseProjectCtrl = function($scope, $modalInstance) {
         $scope.ok = function() {
        $modalInstance.close($scope.chosenProject);
    };

    $scope.cancel = function() {
        $modalInstance.dismiss('cancel');
    };
};

Error: [$compile:tplrt] Template for directive 'modalBackdrop' must have exactly one root element. template/modal/backdrop.html
  http://errors.angularjs.org/1.2.15-build.2378+sha.9335378/$compile/tplrt?p0=modalBackdrop&p1=template%2Fmodal%2Fbackdrop.html


  Error: [$compile:tplrt] Template for directive 'modalWindow' must have exactly one root element. template/modal/window.html
  http://errors.angularjs.org/1.2.15-build.2378+sha.9335378/$compile/tplrt?p0=modalWindow&p1=template%2Fmodal%2Fwindow.html

<div modal-backdrop="" class="ng-scope"></div>
 <div modal-window="" index="0" animate="animate" class="ng-scope"></div>