Can't use Bootcamp partition after update to high sierra

GerdM1

Bit poster
I used Parallels to boot my Windows7 Bootcamp partition last years. A couple weeks ago I updated my Mac to High Sierra and now I'm no longer able to use the Bootcamp partition. I always get the message: "The specified file cannot be used as a virtual hard disk" My Mac has one hard disk, one partition is used by Bootcamp. I haven't found useful threads at the internet about my problem.
 
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