The "traceback" is here

[AmanTripathi]

I have to extract all the numbers in the file and compute the sum of the numbers.

import re
sum=0
name=input('Enter name of file:')
file=open(name)
for lines in file:
    numbers=re.findall('[0-9]+')
    if len(numbers) == 0:
        continue
    for num in numbers:
        no=int(num)
        sum=sum+no
print(sum)

The traceback :

Error:
Traceback (most recent call last):
  File "F:/Python Programs/regular_ass.py", line 7, in <module>
    numbers=re.findall('[0-9]+')
TypeError: findall() missing 1 required positional argument: 'string'

Can someone please explain me the traceback and why is it here?