some user role has a permission issue while running this command.

nlapiSearchRecord

for some native or custom records. It shows

Insufficient privilege

error. Could I know which permission is required please?

You'll likely need the setup "custom records" permission depending on how the custom records are setup However - for anything else, you'd likely need to add the individual records added - and there's no easy way to identify this without knowing what your script is trying to load.

“Find Transaction” is the other one that gets missed