Bench manager: Your system is being updated. Please refresh again after a few moments Status: 503

[justmejust]

Hi every body
i installed bench manager after installing frappe /erpnext
and did the steps of installing .
as in this guid
https://frappe.io/bench-manager
the installation of bench manger is in the frappe-bench folder
after that i tried to access my localhos:8080 as usual which befor the installing bench manager take me to the home of ERPNEXT page login.
but now localhos:8080
take me to this thing in the page

Updating

Your system is being updated. Please refresh again after a few moments

Status: 503

so please guid me how to resolve such issue