Error with nc-snapshot

I have my nextcloud data in /media/disk/ncdata.
/media/disk is a btrfs parent, /media/disk/ncdata is a subvolume
When I manually trigger nc-snapshot I get following error:

/media/disk/ncdata is not a BTRFS mountpoint or snapshot

When i list the subvolume using btrfs subvolume list /media/disk I get

ID 10949 gen 83113 top level 5 path ncp-snapshots/hourly_2020-07-11_101701
ID 11072 gen 96219 top level 5 path ncdata

Does someone know what is the problem and how I can get a snapshot?

Not enough Info provided.
Maybe you could run ncp-report and share via pastebin or similar.

I’d also run

sudo df -hT

To verify usage

And run

sudo dmesg

and check /var/log/syslog
to look for btrfs or other errors.

Thanks for answering!

user@nextcloudpi:~$ sudo df -hT

yields

> Filesystem      Type      Size  Used Avail Use% Mounted on                                                                                                                                                                                                                                                                                                                                                                                   
> udev            devtmpfs  931M     0  931M   0% /dev                                                                                                                                                                                                                                                                                                                                                                                         
> tmpfs           tmpfs     200M   21M  179M  11% /run                                                                                                                                                                                                                                                                                                                                                                                         
> /dev/mmcblk1p1  ext4       59G  7,3G   51G  13% /                                                                                                                                                                                                                                                                                                                                                                                            
> tmpfs           tmpfs     999M     0  999M   0% /dev/shm                                                                                                                                                                                                                                                                                                                                                                                     
> tmpfs           tmpfs     5,0M  4,0K  5,0M   1% /run/lock                                                                                                                                                                                                                                                                                                                                                                                    
> tmpfs           tmpfs     999M     0  999M   0% /sys/fs/cgroup                                                                                                                                                                                                                                                                                                                                                                               
> tmpfs           tmpfs     999M   34M  965M   4% /tmp                                                                                                                                                                                                                                                                                                                                                                                         
> /dev/zram0      ext4       49M   18M   28M  40% /var/log                                                                                                                                                                                                                                                                                                                                                                                     
> tmpfs           tmpfs     200M     0  200M   0% /run/user/1001                                                                                                                                                                                                                                                                                                                                                                               
> /dev/mapper/cr  btrfs     7,3T  3,5T  3,9T  47% /media/ncp-snapshots                                                                                                                                                                                                                                                                                                                                                                         
> /dev/mapper/cr1 btrfs     3,7T  3,5T  162G  96% /media/disk

in the syslog there are no btrfs related errors
in dmesg there are many errors like this:

[2191008.902103] BTRFS info (device dm-0): Snapshot src from another FS
[2191880.138319] BTRFS info (device dm-0): Snapshot src from another FS
[2192800.837723] BTRFS info (device dm-0): Snapshot src from another FS

ncp-report yields https://pastebin.com/1pdJetcX

Do you see something?

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