ad hoc provisioing problem

Question

Hi All,

I am in 10.6.2

I am trying to do ipad ad-hoc provisioning. When I create a development provisioning profile, it builds quite well.

when i create a ad-hoc provisioning, when i double click that provision file, it shows in yellow highlighted "A valid signing identity matching this profile could not be found in your keychain"

what could be the problem ? what are the list of things i should look at to resolve this issue ?

thanks in advance