Figwheel Server: Resource not found

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I'm using luminus with cljs profile and running via figwheel. I've been having no problem but since yesterday figwheel server isn't working. I have no idea why. Does anyone know why?
When I enter the address which is 'localhost:3449', the page comes up stating
"Figwheel Server: Resource not found
Keep on figwheelin' "

I've looked up similar issues mostly posted in 2016, but I found my issue is a little different.

I have made my project like below:
lein new luminus lumi +postgres +reagent
by default, the project didn't create index.html file which usually located in 'resources/public' folder. I guess this file is related to this issue.

But the thing is,
it worked really well until yesterday without index.html file.
But since yesterday(maybe few days more) it stopped working.

I want to fix this problem and also I want to know the reason. Can anybody help me?

Just in case, I'm putting warning message from terminal reporting when I typed lein figwheel.
WARNING: unable to load "cider/wrap-cljs-repl" middleware
I'm not sure whether it's related to my issue