Script bug, can't change a "Saldo:"

Bug description:
when i try to update a “Saldo:” it doesn’t work i can provide you the error after

Expected vs Current Behavior:
i wanted to make my script change a “Saldo:” in another page, for like a bank site, because it’s too difficult for me to make change that all by hand, and it does not work

Steps to reproduce:
?

Bug appears at this link: https://replit.com/@valitrexsyt/MRBANCA

Screenshot(s)/Screen Recording:

Browser/OS/Device: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Replit Profile: https://replit.com/@valitrexsyt