When I go back by clicking setting I got file missing error
It may help to say what version ERPNext and how and when it was installed. Is this happening on first use?
12.x.x develop and yes from first install
This error is also displaying consistently for me too.
A fresh ERPNext (after much effort) was installed in a new Debian 10 build within the past 2 weeks
ERPNext: v12.x.x-develop () (develop)
Frappe Framework: v12.x.x-develop () (develop)
As well as the initial example using Setting, the error occurs whenever trying to go back, e.g. viewing Item List then selecting Stock. After clearing the message you are then stuck in this loop and need to return to the main desk to continue.