Sorry i Used ESXi 5.1 with a SBS 2008 as VM
I think you are confusing "vm" and "vmdk"
The error message says "ERROR: failed to locate and extract VM_ID" which means you are not giving ghetto the right vm name.
Your config says "VMDK_FILES_TO_BACKUP="all"" - so you do not need to give any "vmdk" names since you are doing all of them.
In the vSphere console the vm name displayed is the name you should be giving to ghetto