Tkinter module test: widget class not inserted in application frame

[Rich Shepard]

I'm not seeing the error source in a small tkinter module I'm testing.

The module code:
-----------
import tkinter as tk
from tkinter import ttk

import common_classes as cc

class ConactNameInput(tk.Frame):
     def __init__(self, parent, *args, **kwargs):
         super().__init__(parent, *args, **kwargs)
         # A dict to keep track of input widgets
         self.inputs = {}

         self.inputs['Last name'] = cc.LabelInput(
             ContactNameInput, 'lname',
             input_class = ttk.Entry,
             input_var = tk.StringVar()
             )
         self.inputs['Last name'].grid(row = 0, column = 0)
         #
         self.inputs['First name'] = cc.LabelInput(
             ContactNameInput, 'fname',
             input_class = ttk.Entry,
             input_var = tk.StringVar()
             )
         self.inputs['First name'].grid(row = 0, column = 1)

         okay_button = tk.Button(self, text="OK",
                                 command=self.ok)
         okay_button.pack(side=tk.LEFT, padx=(20, 0), pady=(0, 20))

         cancel_button = tk.Button(self, text="Cancel",
                                   command=self.cancel)
         cancel_button.pack(side=tk.RIGHT, padx=(0, 20), pady=(0, 20))

     def okay_button(self):
         pass

     def cancel_button(self):
         Quitter()

     def get_last_name(self):
         pass

     def get_first_name(self):
         pass


class NameApplication(tk.Tk):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.title("Contact Name")
         self.geometry("800x600")
         self.resizable(width = False, height = False)
         ContactNameInput(self).grid(row = 0, column = 0, sticky=('EWNS'))
         self.columnconfigure(0, weight=1)

if __name__ == '__main__':
     app = NameApplication()
     app.mainloop()
----------

The python error traceback:
----------
Traceback (most recent call last):
   File "contact_history_name_input.py", line 60, in <module>
     app = NameApplication()
   File "contact_history_name_input.py", line 55, in __init__
     ContactNameInput(self).grid(row = 0, column = 0, sticky=('EWNS'))
   File "contact_history_name_input.py", line 17, in __init__
     input_var = tk.StringVar()
   File "/home/rshepard/development/BusinessTracker/views/common_classes.py", line 46, in __init__
     super().__init__(parent, **kwargs)
   File "/usr/lib64/python3.7/tkinter/__init__.py", line 2744, in __init__
     Widget.__init__(self, master, 'frame', cnf, {}, extra)
   File "/usr/lib64/python3.7/tkinter/__init__.py", line 2292, in __init__
     BaseWidget._setup(self, master, cnf)
   File "/usr/lib64/python3.7/tkinter/__init__.py", line 2262, in _setup
     self.tk = master.tk
AttributeError: type object 'ContactNameInput' has no attribute 'tk'
----------

I'm not correctly placing the NameInput class in the NameApplication frame.
What have I missed?

Rich