error message displayed for Ledger

https://actualbalance.com/mcledger/login.php

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/fidatecc/actualbalance.com/mcledger/includes/db_connect.php:7 Stack trace: #0 /home/fidatecc/actualbalance.com/mcledger/system_load.php(4): include() #1 /home/fidatecc/actualbalance.com/mcledger/login.php(2): include('/home/fidatecc/...') #2 {main} thrown in /home/fidatecc/actualbalance.com/mcledger/includes/db_connect.php on line 7

This script does not work with PHP version 7 or above kindly downgrade your php below 7 and it will work fine.