I transfered a live site to a localhost and I am getting errors

Hi,
I transferred a running live site to the localhost by these steps and I am getting errors (note: I'm not the one who made this site).

steps:
1. I moved the files to htdocs and ran xampp
2. imported database and changed the database.php in the config

Now I'm getting errors in the localhost like
1. Message: ini_set(): A session is active. You cannot change the session module's ini settings at this time
Filename: Session/Session_driver.php

2. Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: C:\xampp\tmp)
Filename: Unknown

3. Message: Call to a member function row() on bool
Filename: C:\xampp\htdocs\realnrare\application\models\General.php

- for this one, I var_dumped the query result and it returned bool(false)

- the php version in live is 7.3.29 while the one in the localhost is 7.3.30
I had codeigniter experience but it was long time ago. I'd appreciate any help! Thank you.