Mount raid1 harddisk failed with "Structure needs cleaning"

When i try to mount a xfs harddisk that was a part of linux raid1, i got the following error message
mount: mount /dev/md4 on /mnt/usbhdd1 failed: Structure needs cleaning

I tried exam the harddisk using mdadm --examine, i got the following:
mdadm: No md superblock detected on /dev/md4

when i execute sudo fdisk -l /dev/md4, i got

Disk /dev/md4: 928.4 GiB, 996889951232 bytes, 1947050686 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

What can i do to mount this harddisk successfully?

I’ve moved this to the category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the Finding Help page.