求助：为啥会报错

2019721

import tkinter as tk
import crcmod.predefined


def get_data():
    try:
        calc()
    except ValueError:
        root1 = tk.Tk()
        root1.title("提示")
        label2 = tk.Label(root1, text="请输入正确的十六进制数据\n例如a->0a")
        label2.pack()
        button3 = tk.Button(root1, text="确定", command=root1.destroy)
        button3.pack()
        return False


def calc():
    arr = entry1.get()
    print("计算输入框内的值得校验和")
    crc8 = crcmod.predefined.Crc('crc-8')
    crc8.update(bytes().fromhex(arr))
    data = hex(crc8.crcValue)
    print(data)
    v.set(data)
    return True


def clean():
    print("清除输入框内及生成的校验和")
    entry1.delete(0, 'end')
    entry2.delete(0, 'end')


root = tk.Tk()
root.title("CRC校验和工具")
root.geometry('550x150')

label1 = tk.Label(root, text="请输入需要校验的数据：").grid(row=0, sticky='w', padx=10, pady=5)

entry1 = tk.Entry(root)
entry1.place(x=10, y=30, width=500, height=35)
entry1.insert(0, "默认文本...")

v = tk.StringVar()
testCMD = root.register(get_data)
entry2 = tk.Entry(root, textvariable=v, validate='all', validatecommand=(testCMD, '%P'))
entry2.place(x=75, y=95,  width=50)

button1 = tk.Button(root, text="计算", command=get_data).place(x=10, y=90)

button2 = tk.Button(root, text="清除", command=clean).place(x=200, y=90)

root.mainloop()

为啥计算框内输入内容后，点击计算第一次会报错
报错如下：
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
TypeError: get_data() takes 0 positional arguments but 1 was given

昨非

我这里没问题啊

                               
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