Failed to obtain cryptographic key pair associated with the specified certificate with error 1!8.8X! "%2!s!". Verify that ...

Failed to obtain cryptographic key pair associated with the specified certificate with error 0x%1!8.8X! "%2!s!". Verify that you have the key pair for which the certificate was issued. This error usually occurs when trying to sign a document using a certificate for which the person does not have the private key.