The virtual machine cannot be restored because the datastore named 'datastore' does not exist or is inactive.
The datastore referenced by virtual machine when it was backed up does not exist or is inactive on the ESX/ESXi that you are restoring the virtual machine to.
The virtual machine cannot be restored.
Find the missing datastore or specify the -datastore option on the Restore VM command to specify an existing datastore to restore the virtual machine files to.