Change Authentication Provider on MOSS 2007

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When you try to change Authentication Provider for a Web Application, you could receive this error:

An object of the type Microsoft.SharePoint.Administration.SPWebApplicationProvisioningJobDefinition named "Provisioning 8b10f967-bf6e-482c-9bde-01edec2ac953" already exists under the parent Microsoft.SharePoint.Administration.SPWebService named "". Rename your object or delete the existing object.

Probably your old action is still pending for SharePoint.

Go to Central Admin -> Operation -> Timer Job Definition -> Delete the Provision Web App