how to fix it

[amiz]

bad argument @ 'db exec ' [expected db-connection at argument 1, got nil

[Patrick]

Hi and welcome on the forum.

The error message tell you clearly what is the problem.
You have to pass a database-connection at first parameter in dbExec, BUT your database-connection is not valid (or doesn't exists).

Syntax of dbExec: https://wiki.multitheftauto.com/wiki/DbExec

Edited October 21, 2020 by Patrick