Bootcamp installation error : could not partition disk

/dev/disk0 (internal):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                         251.0 GB   disk0

   1:                        EFI EFI                     314.6 MB   disk0s1

   2:                 Apple_APFS Container disk1         250.7 GB   disk0s2

/dev/disk1 (synthesized):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      APFS Container Scheme -                      +250.7 GB   disk1

                                 Physical Store disk0s2

   1:                APFS Volume Macintosh HD            42.9 GB    disk1s1

   2:                APFS Volume Preboot                 44.4 MB    disk1s2

   3:                APFS Volume Recovery                517.0 MB   disk1s3

   4:                APFS Volume VM                      1.1 GB     disk1s4

/dev/disk2 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            CCCOMA_X64FRE_EN-US... +5.1 GB     disk2

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Here's a screenshot, easier to read.

Thanks for helping

I also tried partitioning in any other type, even APFS, and it failed. Seems to me like a SSD failure... Although the Apple Diagnostic did not find anything wrong. I'll most likely end up going to the nearest Apple Store when I've got the time and let them figure this out...! If you still got ideas though, feel free to keep answering me, I'll try them all!

I wanted to go to the AS anyways because my Mac has been freezing up recently. Not much, just micro-stutters here and there, I first realized while listening to music, it would stutter, either on youtube or Apple Music. I just have to move my mouse from one side to another rapidly for 10-15 seconds and it's easy to see the pointer's movement stoping.

Well that did it. Finishing setting up Windows on my Mac. I have a Windows VM on my external SSD, but I figured it would still be better to get it as a bootable volume performances-wise, so I wanted BootCamp to work, and you fixed it.

Must admit I knew what I had to do (thanks to you!), but I do not know at all what it is I have done.

Thank you very much for that, your help is really appreciated!

I also tried with both version of Windows, October and April, none worked.

There are the details of the failure when trying to partition in FAT :

If I boot in single-user mode (Cmd + S), there is the output (sorry its bad) :

If I just use the Terminal in Recovery mode (Cmd + R) :

Here :

And partitioning the disk in 2 APFSs works now, I'll try with BCA.