vbox 5.0: Error message: A new node couldn't be inserted

[neuronetv]

I'm running a centos6.7 host machine with vbox-5.0. In the past I've used vbox-4.3 and the import and export of vms has always worked fine, but with vbox-5.0 I have problems.
In vbox-5.0 created a fedora 20 vm and called it "fedora" and exported it with the usual command:

Code: Select all

VBoxManage export --output fedora.ovf

all goes ok and the export creates two files, fedora-disk1.vmdk and fedora.ovf.
But when I unregister and delete the original machine and then import it again the import appears to go fine but the vm won't start, it gives this error every time:

Error: failed to start machine. Error message: A new node couldn't be inserted because one with the same name exists. (VERR_CFGM_NODE_EXISTS)

I noticed that when I create the the original vm it comprises three files in /home/<user>/VirtualBox\ VMs/fedora which are:
fedora.vbox fedora.vbox-prev fedora.vdi
however when I import the the vm it only creates two files thus:
fedora-disk1.vmdk fedora.vbox
which is obviously different from the original vm, I'm assuming this is why I'm getting the error and the vm won't start up. What's the solution to this? thanks for any pointers.

[noteirak]

Please attach the fedora.vbox from the exported appliance.

[neuronetv]

apologies for the delay in replying, I lost the whole machine and had to restore it from a backup. I zipped fedora.vbox to fedora.zip and it's attached.