"No CoreStorage logical volume groups found" when trying to resize bootcamp

Hello, I have a 21.5'' late 2011 iMac with MacOs Sierra 10.12.6 and i already resized successfully my windows 10 bootcamp partition long ago using the accepted answer in this question: mac - Resizing Windows 10 Bootcamp partition manually - Super User

but now i need to resize it again and i'm facing this problem when typing the command "diskutil cs list"

It's showing me this error "No CoreStorage logical volume groups found".

Both my OSs (Mac and Windows) work well I can easily switch between them with no problem, except in this instance:

When i'm clicking "Restart in OS X..." it's showing me this:

but if i do it from here (clicking on "Boot Camp Control Panel..." instead) it works:

Can someone help me please?

Thank you.