SP Administrative Service is not enabled

Error message (when deploying or retracting solution):
The timer job for this operation has been created , but it will fail because the administrative service for this server is not enabled. If the timer job is scheduled to run at a later time, you can run the jobs all at once using stsadm -o execadmsvcjobs. To avoid this problem in future , enable the Windows SharePoint services administrative service, or run your application through the STSADM.exe command line utility.

Solution:

1. Start --> Run --> services.msc
   
2. Look for Windows Sharepoint Services Administration.
   
3. Start the service