kernel panic-not syncing: VFS: unable to mount root fs on unknown block(0,0)

[clgies]

Hello,
Unfortunately, the current Proxmox ISO (proxmox-ve_5.2-1) does not boot.
I get the error message:
kernel panic-not syncing: VFS: unable to mount root fs on unknown block (0,0)
An idea why?

 

[Orkhan]

Hello!

How you solve this problem?