Thawte Certificate cannot be used to sign Setup.msi

HI All,

Could you please help me in resolving this issue with Thawte certificate. I exported the AIR file using the Thawte certificate, but when i use the ADT command to package it into exe(for ex : adt -package -target native  -storetype pkcs12 -keystore <<new cert>> myNativeExe.exe migratedApp.air), it is giving me error msg "Certificate in xxx.p12 could not be used to sign setup.msi".

I'm using Windows 7 machine and Adobe Flex Builder 3.

If anyone could suggest a workaround to this issue will be very helpful.

Thanks,

Issac