failed to list mountpoints

[a-joyes]

Hello, I have this message when come the installation :
Setup [1/24]: vgremove
Setup [2/24]: pvremove
Setup [3/24]: pvremove
Setup [4/24]: label
panic : failed to run setup operation label: label: failed to unmount partition /dev/sda1: failed to list mountpoints for /dev/sda1: lsblk: /dev/sda1: not a block device

Can you help me please ?
Thx