ValueError: could not convert string to float:

[RandomCoder]

i tried to write a small program using tkinter and other small libraries, but i ran into a problem converting the string into a float in line 13, could anyone help? there might be some other inconsistencies in the program as well (because i didnt really finish it yet), if you can also help me with those, that would be awesome, thank you!

import tkinter as tk
import random
import time
window = tk.Tk()

def startthing():
    random_float = random.random() + 1
    limit = random.randint(0,10)
    x = 0
    bet = bettingentry.get()
    value = int(rising["text"])
    while x!=limit:
        betting["text"] = (float(bet) * random_float)
        x = x + 1
        time.sleep(1)
    


rising = tk.Label(text = 1)
rising.pack()

betting = tk.Label(text = 0)
betting.pack()

bettingentry = tk.Entry()
bettingentry.pack()

buttonentry = tk.Button(
    text = "bet the money /",
    command = startthing()
)
buttonentry.pack()
buttonentry.bind("<Button-1>", startthing())

window.geometry('500x500')
window.mainloop()

Error:
File "/Users/nope/Desktop/testing_app.py", line 13, in startthing
betting["text"] = (float(bet) * random_float)
ValueError: could not convert string to float: