After an windows automatically update. I could not use my docker toolbox any more. It gave the following error.
Then I noticed my docker windows is running (which means Hyper-V was enabled again by the update), but not working either.
I checked the apps and features and proved that the hyper-v was enabled again. So I disabled it and restarted the machine.
Now docker windows complain about missing hyper-v but docker toolbox is still not working.
So I used the following the command to disable hyper v again. (run as administrator)
dism.exe /Online /Disable-Feature:Microsoft-Hyper-V
Then restarted my machine. My docker toolbox is back.