No dashboard show

hello! i try to connect node-red with mqtt and esp8266 board yesterday i still open dashboard to control my motor but today i can't see my dashboard.
why? and how can i fix it ?

thank you so much

This reply timed out.

hello ser i just got to see the reply you send me
yes it happenning on this

it has no dashboard

Open the developer tools in the browser and see if any errors are shown.