I'm using MLknn in a large code base. I'm runing the same code in parallel 10 times. On the 10th run of the code I get this error. Help me understand the error so that I know where I'm going wrong.

file "/home/honey/anaconda3/lib/python3.8/site-packages/skmultilearn/adapt/mlknn.py", line 236, in predict
result = sparse.lil_matrix((X.shape[0], self._num_labels), dtype='i8')
AttributeError: 'MLkNN' object has no attribute '_num_labels'