Error: [$injector:modulerr] Failed to instantiate module app due to: [$injector:modulerr] Failed to instantiate module ui.bootstrap

Question

var app =  angular.module('app', ['controllers','ui.bootstrap']);

and I have put ui 'ui.bootstrap' file in asset\js\dependencies but showing the above

Error: [$injector:modulerr] Failed to instantiate module app due to: [$injector:modulerr] Failed to instantiate module ui.bootstrap due to: [$injector:nomod] Module 'ui.bootstrap' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.