ADCS Migration "encountered an error"

Hi all,

I encountered a problem to migrate my ADCS standalone Root CA (Server 208) to a destination Server 2012 Standard 

I am following this giude: http://technet.microsoft.com/en-us/library/9aa53be9-0497-49fa-9ff6-09b72cb69444(v=ws.10)#BKMK_BackupCAPolicy

Steps:

• CA backup…………During This step encountered an error “windows cannot back up one or more private keys because the CSP does not support key export. Do you want to continue and backup only the private keys that can be exported”, still it exported the certificate.
• CA configuration backup

But when I start to set up a CA on a destination server, the error "The imported certificate does not match the chosen CA type and will not be used. However, the imported key can still be used" appears during the step: For a migration, on the Set up Private Key page, select Use existing private key. And the installation stop...

Thanks for your help.

Regards.