diff --git a/conv_net_classes.py b/conv_net_classes.py
index a2af316..189f3f9 100644
--- a/conv_net_classes.py
+++ b/conv_net_classes.py
@@ -328,7 +328,7 @@ def errors(self, y):
         # check if y has same dimension of y_pred
         if y.ndim != self.y_pred.ndim:
             raise TypeError('y should have the same shape as self.y_pred',
-                ('y', target.type, 'y_pred', self.y_pred.type))
+                ('y', y.type, 'y_pred', self.y_pred.type))
         # check if y is of the correct datatype
         if y.dtype.startswith('int'):
             # the T.neq operator returns a vector of 0s and 1s, where 1