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As per the traceback when python is trying to load modules it is unable to find the class 'LibvirtDriver, What I suggest is try to see if that module is installed or not.

As you have two compute nodes, login to the compute node that is working and see the file and the module which it is trying to import. Modules would generally be in '/usr/lib/python2.x/dist-packages/'.

Once you do that perform the same thing in the second compute node(The faulty one). You will get to know which module is not present in the second node and finally install it manually.

Note- You need to have a good knowledge of python else it will be a deep sea :P. Secondly before proceeding with this solution double check your configuration files as if that is the cause there is no need to debug the modules .