No such file or directory while trying to open /dev/part_boo

Hello,
when i load an image in a qemu image and I start the kvm virtual machine I receive following error:

/sbin/tune2fs: No such file or directory while trying to open /dev/part_boot
Couldn’t find valid filesystem superblock.
mount: special device /dev/part_boot does not exist

ERROR: Failed to mount /boot partition

It seems that the image I load has created a partition when they were installed manually the components. Then after installation of the components we took the image.
Do you have any clue about how to solve it?