fv_core test failed to run on Vitualization system

Issue

• fv_core test failed to run. Getting following errors:

> v7 run --test fv_core  
> loaded results /var/v7/results.xml  
> Tested OS: Red Hat Enterprise Linux Server 5 (Tikanga)  
> Kernel RPM: kernel-xen-2.6.18-194.11.1.el5  
> v7 version 1.1, release 24  
> Verifying V7 Server...  
> Version 1.1 Release 24  
> Warning: V7 server is from a prior release.  
> .  
> .  
> .  
> .  
> .  
> .  
> FV Guest started ...  
> fv_core test is running, it takes some time(less than 60 minutes), please be patient ...  
> You may use "virsh console v7x86_64" to monitor the testing progress  
> Guest has shutdown  
> Using loopback device /dev/loop5 for guest data image  
> add map loop5p1 : 0 192717 linear /dev/loop5 63  
> Mounted /dev/mapper/loop5p1 on /mnt  
> Traceback (most recent call last):  
> File "./fv_core.py", line 34, in ?  
> returnValue = test.do(sys.argv)  
> File "/usr/share/v7/lib/v7/test.py", line 255, in do  
> return self.run()  
> File "/usr/share/v7/lib/v7/fvtest.py", line 491, in run  
> if not self.getGuestResults():  
> File "/usr/share/v7/lib/v7/fvtest.py", line 439, in getGuestResults  
> result = self.getGuestTestRunResult()  
> File "/usr/share/v7/lib/v7/fvtest.py", line 456, in getGuestTestRunResult  
> results.load(self.environment.getResultsFileName())  
> File "/usr/share/v7/lib/v7/certificationtest.py", line 60, in load  
> self.deviceClasses[deviceClass.getName()] = deviceClass  
> AttributeError: 'NoneType' object has no attribute 'getName'  
> ...finished running ./fv_core.py, exit code=1