Steps to fix this problem:
Open command prompt
run Final command_5
Oracle VM Instalation directory_1:
example -> C:\Program Files\Oracle\VirtualBox
Commands_2:
internalcommands sethdparentuuid
Snapshot location_3: (copy from error window)
example -> C:\Users\user1\VirtualBox VMs\Linux_18.04\Snapshots/{f11cdaf4-92e3-407e-ab6d-6e4786ee10a4}.vhd
UUID of the parent disk_4: (copy from error window)
example -> {eaa88725-f284-4e01-aa55-0f7371d35464}
Final command_5: (in command prompt)
VBoxManage.exe Commands_2 "Snapshot location_3" UUID of the parent disk_4
example -> VBoxManage.exe internalcommands sethdparentuuid "C:\Users\user1\VirtualBox VMs\Linux_18.04\Snapshots/{f11cdaf4-92e3-407e-ab6d-6e4786ee10a4}.vhd" {eaa88725-f284-4e01-aa55-0f7371d35464}