transplant_class..C) ... ERROR in python

Question

I am running python suite using nosetests(nose==1.3.7,nose-testconfig==0.10) framework with pythom3.5.2, recently started facing issue in running suite. This error comes the beginning of every test folder. for example i have below folder structure:

DIR
---SUBDIR_1
------test_1
------test_2
---SUBDIR_2
------test_1
------test_2

when test start there is no error , runs SUBDIR1 testcases successfully but when starting SUBDIR2 then error comes. And this is being repetitive for all subfolders.

ERROR is:

> "__init__ (base.tests.aabc_service.test_testname.transplant_class.<locals>.C)
> ... ERROR"

Same set of test running fine at local with same folder and infra.

Any help is highly appreciated.