KeyError: 'vmwarehostname'

erori vmchecker

Traceback (most recent call last):
  File "/usr/local/bin/vmchecker-vm-executor", line 522, in <module>
    main()
  File "/usr/local/bin/vmchecker-vm-executor", line 513, in main
    test_submission(bundle_dir, vmcfg, assignment)
  File "/usr/local/bin/vmchecker-vm-executor", line 410, in test_submission
    asscfg, bundle_dir, vmx_path)
  File "/usr/local/bin/vmchecker-vm-executor", line 349, in try_power_on_vm_and_login
    power_on_with_message_handler(vm, vmwarecfg, vmx_path)
  File "/usr/local/bin/vmchecker-vm-executor", line 309, in power_on_with_message_handler
    vmwarecfg.vmware_hostname(),
  File "/usr/local/lib/python2.7/dist-packages/vmchecker/config.py", line 308, in vmware_hostname
    return self.tstcfg.get(self.tester_id, 'VmwareHostname')
  File "/usr/local/lib/python2.7/dist-packages/vmchecker/confdefaults.py", line 87, in get
    return self.section_ids[section_id][option.lower()]
KeyError: 'vmwarehostname'


Traceback (most recent call last):
  File "/usr/local/bin/vmchecker-vm-executor", line 522, in <module>
    main()
  File "/usr/local/bin/vmchecker-vm-executor", line 513, in main
    test_submission(bundle_dir, vmcfg, assignment)
  File "/usr/local/bin/vmchecker-vm-executor", line 410, in test_submission
    asscfg, bundle_dir, vmx_path)
  File "/usr/local/bin/vmchecker-vm-executor", line 347, in try_power_on_vm_and_login
    revertToSnapshot(vm, vm.nRootSnapshots - 1)
  File "/usr/local/bin/vmchecker-vm-executor", line 79, in revertToSnapshot
    vm.revertToSnapshot(snaps[snapNr])
pyvix.vix.VIXException: The file is already in use