The startup disk cannot be partitioned or restored to a single partition. Windows 10 and Mojave iMac Fusion Drive The startup disk cannot be partitioned or restored to a single partition.

The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.

I had installed Windows 10 via bootcamp in my mac. Current version is 10.14.2

I received a strange blue screen error and repaired windows. After the repair the boot camp assistant and tools was not installed so its just a copy of windows without boot camp assistance. I would like to erase that volume and try again but boot camp assistant will not erase the drive. 

This is the output of diskutil list



And here is the output of diskutil cs list



Can anyone please help me, I would follow the advice already provided on this site concerning this issue, but my fusion drive issue is just a little different.
This is a very common question. Again, here is the commands you need to enter in a Terminal application window.

The next two commands will remove the unlabeled "Window Recovery" disk1s4 partition and the "Microsoft Basic Data" disk1s3 partition labeled BOOTCAMP 

sudo diskutil eraseVolume free none disk1s4
sudo diskutil eraseVolume free none disk1s3


The next command return the free space back to the disk1s2 APFS container partition.

sudo diskutil apfs resizeContainer disk1s2 0