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Hi, check that <projectName>.pch file is filled in this way:

#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#endif

#import <Availability.h>

#ifndef __IPHONE_5_0
#warning "This project uses features only available in iOS SDK 5.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
#endif

Andrea