Possible Duplicate:
iPhone app signing: A valid signing identity matching this profile could not be found in your keychain
I have created the app id on my apple iOS provisioning portal for my app.
When i am going to create provision profile for my device and drag it to Xcode Organizer is showing error "Valid Signing Identity not found".
How to overcome this error?
I have revoke my apple certificate. key chain access show my apple certificate valid.
After revoking my certificate i got email from apple that say
(Dear User,
You have revoked your APS Development Certificate and it is no longer valid. Please note that all Provisioning Profiles that included this certificate are now invalid and will require regeneration for future use.
Best regards,
Apple Developer Program Support)
What is error in my provisioning profile of device if any know solution plz reply
Key chain Access screen 
XCODE Organizer screen 