Need a PHP and Open Cart Expert ASAP

READ EVERYTHING.

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THE PROBLEM

I just upgraded an OC2 database into an OC4 database.

And now I am getting the following 4 error messages when I try to login, see below:

Warning: Undefined array key "" in /public_html/admin/controller/startup/language.php on line 21

Warning: Trying to access array offset on value of type null in /public_html/admin/controller/startup/language.php on line 21

Warning: Undefined array key "" in /public_html/admin/controller/startup/language.php on line 27

Warning: Trying to access array offset on value of type null in /public_html/admin/controller/startup/language.php on line 27

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DON'T BE A ROBOT, PROVE YOU ARE HUMAN

If you can help me fix this, write at the beginning of your bid "I CAN FIX THIS PHP ERROR"

I will provide full CPANEL access.

I can pay up to $60 dollars maximum at the moment for this.

If more money is needed I will analyze the situation and increase my budget.