CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY

A trigger or flow threw an unhandled exception during the save. This code is a wrapper. The real cause follows in the message.

CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, AccountTrigger: execution of AfterInsert
caused by: System.NullPointerException: Attempt to de-reference a null object
Class.AccountHandler.setRegion: line 42, column 1

Common causes

• An Apex exception inside a trigger or its handler class.
• A managed package trigger failing on your data.
• A record-triggered flow failing on an element.

How to fix

• Read the text after caused by and look up that exception in this guide.
• Go to the class and line number named in the message.
• Reproduce the save with a debug log running to see the values involved.
• For managed package triggers, check the package configuration and contact the vendor.