cannot find unique constraint on easy_thumbnails_thumbnails while running jenkins

I am running into below error while running jenkins for my django project -

File "/Library/Python/2.7/site-packages/easy_thumbnails/migrations/0015_auto__del_unique_thumbnail_name_storage_hash__add_unique_thumbnail_sou.py", line 12, in forwards

    db.delete_unique('easy_thumbnails_thumbnail', ['name', 'storage_hash'])

  File "/Library/Python/2.7/site-packages/south/db/generic.py", line 479, in delete_unique

    raise ValueError("Cannot find a UNIQUE constraint on table %s, columns %r" % (table_name, columns))

ValueError: Cannot find a UNIQUE constraint on table easy_thumbnails_thumbnail, columns ['name', 'storage_hash']

you can find the details error message -

https://github.com/SmileyChris/easy-thumbnails/issues/208

Any idea what might be wrong?

Thanks.

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