SPIisWebsiteUnprovisioningJobDefinition Error while deleting a Web Application in SharePoint

The following error might occur while deleting a web application in SharePoint "An object of the type Microsoft.SharePoint.Administration.SPIisWebsiteUnprovisioningJobDefinition named "Unprovionsing PWN" already exists under the parent Microsoft.SharePoint.Administration.SpWebservice named "". Rename your object or delete the existing object."

A possible solution for this issue can be,

• Navigate to the Central Administration Site,
• Go to the Operations tab
• click on the Timer Job Definition
• Delete the Unprovisionning web application from the list
• Go ahead and Delete the Web application.