ImportError: __import__ not found ERPNext

hello friends I was doing some validation in Custom Script and now when trying to save information in the customer module I get the following error.

image

I am using version 12.

Server scripts run in a restricted context for ensuring security. You can’t import any external python module in server scripts.

So, do you have any idea why that message appears to me?

in the supplier if you allow me to save information

Have you added any custom Server Scripts?

I created one, but deleted it thinking it was the cause of the error.