Plot: Fix missin import.

src/View/Plot/APlot.py

@@ -16,6 +16,8 @@
 
 # -*- coding: utf-8 -*-
 
+from Model.Except import NotImplementedMethodeError
+
 class APlot(object):
     def __init__(self, canvas=None, data=None, toolbar=None):
         super(APlot, self).__init__()