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tkinter.TclError: bad window path name
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tkinter.TclError: bad window path name
#3
The problem is caused by you making a new window each time the Columns button is pressed. Though wasteful and potentially confusing, this would work if you also reset the column_values array.

I added some comments below to point out the problem spots.
def get_columns(field_names):
    new_window = Toplevel(mw)
    new_window.wm_title("Select Columns")
    new_window.geometry('900x500+250+150')

    frame3 = Frame(new_window)
    framebot = Frame(new_window)
    frame3.pack(side=TOP,fill=X)
    framebot.pack(side=BOTTOM,fill=X)
 
    for i in range(0,max_columns):
      column_values.append([])  # 2nd time around column_values is not empty
      j = 0
      # 2nd time around column_values[0] holds two combo boxes, one which doesn't exist
      # anymore because you deleted it.
      column_values[i].append(ttk.Combobox(frame3,values=field_names))
      # column_values[0][0] is the deleted combo box
      column_values[i][j].grid(row=i,column= j)
 
    exit_button = Button(framebot,text='Exit',font=("Times",16),command=new_window.destroy).pack(side="right")
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Messages In This Thread
RE: tkinter.TclError: bad window path name - by deanhystad - Apr-25-2020, 10:00 PM

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