Problem: Error 1 Error occurred in deployment step 'Install app for SharePoint': The requested service,
'http://vijay:32843/a89a67b860dc473a9055912c37c4c423/AppMng.svc' could not be activated. See the server's diagnostic trace logs for more information.
0 0 MyFirstApp
Reason: Open the Url http://vijay:32843/a89a67b860dc473a9055912c37c4c423/AppMng.svc so you come to know the issue because free memory is less than a total memory.
Solution: To Overcome this we need to restart the service of "SPSearchHostController" Or stop the some of the service running for sharepoint 2013.