Multiprocessing error : self = reduction.pickle.load(from_parent) AttributeError: Can't get attribute 'calc_square' on <module '__main__' (built-in)> - multiprocessing

Question

I am trying to write simple code in shared memory in multiprocessing. I am getting errors. Please help me to solve this.
import multiprocessing
import time
def calc_square(numbers, q):
for n in numbers:
q.put(n*n)
def calc_cube(numbers, q):
for n in numbers:
q.put(n*n*n)
if __name__ == "__main__":`enter code here`
numbers = [2,3,5,7,9,10]
numbers2 = [2,3,5,7,9,10]
q = multiprocessing.Queue()
q2 = multiprocessing.Queue()
p = multiprocessing.Process(target=calc_square, args=(numbers,q))
p1 = multiprocessing.Process(target=calc_square, args=(numbers2,q2))
time.sleep(0.05)
p.start()
p1.start()
p.join()
p1.join()
while q.empty() is False:
print(q.get())
while q2.empty() is False:
print(q2.get())
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\Hello\AppData\Local\Programs\Python\Python310\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "C:\Users\Hello\AppData\Local\Programs\Python\Python310\lib\multiprocessing\spawn.py", line 126, in _main
self = reduction.pickle.load(from_parent)
AttributeError: Can't get attribute 'calc_square' on <module '__main__' (built-in)>
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\Hello\AppData\Local\Programs\Python\Python310\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "C:\Users\Hello\AppData\Local\Programs\Python\Python310\lib\multiprocessing\spawn.py", line 126, in _main
self = reduction.pickle.load(from_parent)
AttributeError: Can't get attribute 'calc_square' on <module '__main__' (built-in)>