Originally Posted by ragu.
"certificate error contact the application supplier"
You can consult with the link in #2.
as well as you do have the device IMEI included in the certificate
You say you have a developer certificate. It is always restricted to a couple devices. However in this case you would get a "Constrained by the certificate" message.
if you have a developer certificate, it is only valid for the devices which IMEIs are included in it. So do check that the device you are trying to use is included in the certificate.