pythonのエラーの意味が分かりません。

このプログラムを起動すると以下のようなエラーが出ます。これはどういう意味なのでしょうか？また、どこがエラーの要因なのでしょうか？

python
1import tkinter as tk
2#ここでID決定
3import random
4piece=['O','O','O','O','O','O','O','O']
5
6while True:
7    id_100=(random.randint(0,8))
8    id_10=(random.randint(0,8))
9    id_1=(random.randint(0,8))
10    idnumber=id_100*100 + id_10*10 + id_1
11    if idnumber < 960.5:
12        break
13    print('ID ',idnumber," 数値オーバーです")
14
15idint=int(idnumber)
16print('ID:',id_100,id_10,id_1)
17W_bisiop=idint%4 #白のビショップのコード
18idint2=idint//4
19B_bisiop=idint2%4 #黒のビショップのコード
20idint3=idint2//4
21queen=idint3%6
22Q_search=queen
23queen_place=0
24piece[(W_bisiop*2+2)-1]='B'
25piece[(B_bisiop*2)]='B'
26
27while True :#クイーンのコード
28    if  Q_search==0 and piece[queen_place]=='O':
29        break
30    else:
31        if piece[queen_place]=='O':
32            Q_search -= 1
33        queen_place += 1
34
35KRN=idint3//6
36
37if KRN==0:
38    KRNlist=['N','N','R','K','R']
39
40if KRN==1:
41    KRNlist=['N','R','N','K','R']
42
43if KRN==2:
44    KRNlist=['N','R','K','N','R']
45
46if KRN==3:
47    KRNlist=['N','R','K','R','N']
48
49if KRN==4:
50    KRNlist=['R','N','N','K','R']
51
52if KRN==5:
53    KRNlist=['R','N','K','N','R']
54
55if KRN==6:
56    KRNlist=['R','N','K','R','N']
57
58if KRN==7:
59    KRNlist=['R','K','N','N','R']
60
61if KRN==8:
62    KRNlist=['R','K','N','R','N']
63
64if KRN==9:
65    KRNlist=['R','K','R','N','N']
66
67piece[queen_place]='Q'
68
69KRN_number=0
70
71while True:
72    if len(KRNlist)==0:
73        break
74    else:
75        if piece[KRN_number]=='O':
76            piece[KRN_number] = KRNlist[0]
77            del KRNlist[0]
78        KRN_number += 1
79# N...1 B...2 R...3 Q...4 K...5　と定義する
80piece_code=[]
81for num in range(8):
82    if piece[num]=='N':
83        piece_code.apped(1)
84    if piece[num]=='B':
85        piece_code.apped(2)
86    if piece[num]=='R':
87        piece_code.apped(3)
88    if piece[num]=='Q':
89        piece_code.apped(4)
90    if piece[num]=='K':
91        piece_code.apped(5)
92print(piece)
93print(piece_code)
94#ここまで
95root=tk.Tk()
96canvas=tk.Canvas(root,width=800,height=80)
97canvas.pack()
98canvas.create_text(0, 5, text='ID:',font=("DSEG14 Classic",50),anchor="nw")
99canvas.create_text(120, 5, text=str(id_100) + str(id_10) + str(id_1),font=("DSEG7 Classic",50),anchor="nw")
100root.mainloop()
101