Bootcamp on the external driver

I made a clone image of Window 10 Bootcamp
I’ve got trouble making Bootcamp onto the external SSD driver with Winclone 6 Standard
I am using Mac mini, MacOS Sierra version 10.12.3
At the end of process of Restore To Volume onto the external driver,
there is a message saying " Error, Mounting EFI "
I tried three times and still got the same message.
when rebooting it, it could not see the Bootcamp external driver

please help! thanks

Is it possible that disk doesn’t have a GPT partition table?

Verify that it is GPT formatted by going to the Apple Menu and selecting “About this Mac”. Click System Report and look under storage. Select the Windows partition and verify the Partition Map Type is GPT.

This explains how to make it GPT partitioned: