[ANDROID] java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

앱을 실행하던 도중 다음과 같은 에러가 떴다. E AndroidRuntime: FATAL EXCEPTION: Thread-2656 E AndroidRuntime: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() E AndroidRuntime: at android.os.Handler.

(Handler.java:204) E AndroidRuntime: at android.os.Handler.(Handler.java:118) E AndroidRuntime: at android.app.Dialog.

(Dialog.java:123) E AndroidRuntime: at android.ap.....