See the following traceback in the schema.err file : 

/cs-shared-test/test_runs/nodeb8/2015_06_06_14_26_09/b8/contrail

The above is a description of an error in a Python program.  Here is                                                                                                                                                                                                          the original traceback:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Traceback (most recent call last):                                                                                                                                                                                                                                              File "/usr/lib/python2.7/dist-packages/schema_transformer/to_bgp.py", line 3655, in launch_arc                                                                                                                                                                                  transformer.process_poll_result(result)                                                                                                                                                                                                                                     File "/usr/lib/python2.7/dist-packages/schema_transformer/to_bgp.py", line 3252, in process_poll_result                                                                                                                                                                         func(idents, meta)                                                                                                                                                                                                                                                          File "/usr/lib/python2.7/dist-packages/schema_transformer/to_bgp.py", line 3029, in delete_virtual_machine_interface_virtual_machine                                                                                                                                            VirtualMachineInterfaceST.delete(vmi_name)                                                                                                                                                                                                                                  File "/usr/lib/python2.7/dist-packages/schema_transformer/to_bgp.py", line 2118, in delete                                                                                                                                                                                      cls._vn_dict[self.virtual_network].remove(vmi)                                                                                                                                                                                                                            NameError: global name 'self' is not defined