Typeerror: 'float' object is not iterable

ini ada program saya ketika di run eror mohon bantuannya terima kasih...

import math import mylib as myl

teks1 = myl.readTextFile('D:\\e.txt') teks2 = myl.readTextFile('D:\\d.txt')

for i in range(len(teks1)): a = ord(teks1[i]) - ord(teks2[i]) jum= sum(math.sqrt(a)) mse = jum / len(teks1) print(mse)