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Android

Build error after refactoring name of a class, Android Studio

In Android studio, i refactored (renamed) a name of a class. But then it failed to build the app, and says "Unable to read class file: ..(some path) \funfacts\oldclassname.class". I mean it still searches for old name of the class and does not build the app. The old name was a bit weird and I really want to replace it with new one. How can i fix it? Thank you.