diff --git a/quapy/error.py b/quapy/error.py
index e737015..0466b94 100644
--- a/quapy/error.py
+++ b/quapy/error.py
@@ -3,7 +3,7 @@
 import numpy as np
 from sklearn.metrics import f1_score
 import quapy as qp
-from functional import AitchisonDistance
+from quapy.functional import AitchisonDistance
 
 
 def from_name(err_name):
diff --git a/quapy/protocol.py b/quapy/protocol.py
index 95b8029..4a7cb71 100644
--- a/quapy/protocol.py
+++ b/quapy/protocol.py
@@ -8,8 +8,6 @@ from contextlib import ExitStack
 from abc import ABCMeta, abstractmethod
 from quapy.data import LabelledCollection
 import quapy.functional as F
-from os.path import exists
-from glob import glob
 from collections.abc import Iterable
 from numbers import Number