'list' object has no attribute 'plot' problem

[BaartCM]

Error is as follows;

Error:
Traceback (most recent call last):
  File "C:\Users\Steve\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
  File "C:/Users/Steve/PycharmProjects/newGUI/main.py", line 316, in open_file
    self.plot(self.tab1, self.tab2, self.tab3, self.tab4, canal_1, canal_2, canal_3, chan_no=1)
  File "C:/Users/Steve/PycharmProjects/newGUI/main.py", line 247, in plot
    ax_11.plot(X1[0:twflen], twf[0:twflen])
AttributeError: 'list' object has no attribute 'plot'

Cheers, Steve.