YOLOv5标签转换的问题，报错。

在使用YOLOv5的过程中，标签由json转变为txt文本的时候出现问题，报错了，不知道哪里出错了，是不是标签的命名上？

import json
import os

name2id = {'cone_pointer': 0, 'ball_pointer': 1, 'T_pointer': 2, '20_20_scale': 3, '3_30_scale': 4, '10_100_scale': 5,
           'LED_1': 6, 'LED_HORIBA': 7, 'LED_circle_blue': 8, 'LED_rectangle_blue': 9, 'LED_yellow_mode': 10,
           'shell_ball': 11, 'shell_cone_T': 12, 'shell_aluminium': 13, 'sensor_1': 14, 'red_float': 15}  # 标签名称


def convert(img_size, box):
    dw = 1. / (img_size[0])
    dh = 1. / (img_size[1])
    x = (box[0] + box[2]) / 2.0 - 1
    y = (box[1] + box[3]) / 2.0 - 1
    w = box[2] - box[0]
    h = box[3] - box[1]
    x = x * dw
    w = w * dw
    y = y * dh
    h = h * dh
    return (x, y, w, h)


def decode_json(json_floder_path, json_name):
    txt_name = 'C:\\yolov5\\Meter_Collection\\datasets\\labels\\train\\txt' + json_name[0:-5] + '.txt'
    # 存放txt的绝对路径
    txt_file = open(txt_name, 'w')

    json_path = os.path.join(json_floder_path, json_name)
    data = json.load(open(json_path, 'r', encoding='gb2312', errors='ignore'))

    img_w = data['imageWidth']
    img_h = data['imageHeight']

    for i in data['shapes']:

        label_name = i['label']
        if (i['shape_type'] == 'rectangle'):
            x1 = int(i['points'][0][0])
            y1 = int(i['points'][0][1])
            x2 = int(i['points'][1][0])
            y2 = int(i['points'][1][1])

            bb = (x1, y1, x2, y2)
            bbox = convert((img_w, img_h), bb)
            txt_file.write(str(name2id[label_name]) + " " + " ".join([str(a) for a in bbox]) + '\n')


if __name__ == "__main__":

    json_floder_path = 'C:\\yolov5\\Meter_Collection\\datasets\\labels\\train\\json'
    # 存放json的文件夹的绝对路径
    json_names = os.listdir(json_floder_path)
    for json_name in json_names:
        decode_json(json_floder_path, json_name)

报错内容如下：

C:\ProgramData\Anaconda3\envs\yolov5_38\python.exe C:/yolov5/json_txt.py
Traceback (most recent call last):
  File "C:/yolov5/json_txt.py", line 54, in 
    decode_json(json_floder_path, json_name)
  File "C:/yolov5/json_txt.py", line 45, in decode_json
    txt_file.write(str(name2id[label_name]) + " " + " ".join([str(a) for a in bbox]) + '\n')
KeyError: '20_200_sacle'

Process finished with exit code 1

遇到瓶颈了，希望解答一下。