I had this error in my client app that uses compojure-api. The cause of this problem is that I put the static assets routing configuration in the wrong place. We put (route/resources "/") inside defapi which is a place for api routing configurations. So to fix this, we create a defroutes for static assets routing config and merge this defroutes with defapi before giving it to webserver as a ring handler. At the end, the code look something like this.
(:require [compojure.api.sweet :refer [defapi]]
[compojure.core :refer [defroutes routes]]
[compojure.route :as route]))
(defn handler 
(route site app))
This link and this link explain it really well and concise
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