iOS: Implemented MWPhotoBrowser but some of my project header files are not found

I'm trying to implement MWPhotoBrowser and followed every of its instructions. However, when I try compiling it, it came out with an error:

ARC Semantic Issue: No visible @interface for 'SideBarMenuAPI' declares the selector 'setUpChildViewWithChildVC:'

For your information, SideBarMenuAPI is one of the header files in my projects (not related to MWPhotoBrowser).

I suspect the issue may be that I switched "Always Search User Path" to "Yes" and set the "User Header Search Paths" to "../**" (as required by MWPhotoBrowser), because when I change either one, the error disappear but another error came out that it can't find 'MWPhotoBrowser.h".

Anyone has any idea on how to fix this?