Objective c + Tesseract issue - objective-c

Question

I've simple code that performs recognition text on image as below:
#import "ParseLinesFromImage.h"
#import <TesseractOCR/TesseractOCR.h>
#implementation ParseLinesFromImage
- (void) performRecognitionWithImage:(UIImage*)image
{ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
G8Tesseract* tesseract = [[G8Tesseract alloc] initWithLanguage:#"eng"];
tesseract.language = #"eng";
tesseract.engineMode = G8OCREngineModeTesseractCubeCombined;
tesseract.pageSegmentationMode = G8PageSegmentationModeAuto;
tesseract.maximumRecognitionTime = 60.0;
tesseract.image = [image g8_blackAndWhite];
BOOL recognized = [tesseract recognize];
if (recognized == YES)
{
NSDictionary *array = [self parseValidLines:tesseract.recognizedText];
dispatch_async(dispatch_get_main_queue(), ^{
[self.delegate sucessWithText:array];
});
}
else
{
dispatch_async(dispatch_get_main_queue(), ^{
[self.delegate failedTextReader:nil];
});
}
});
}
Code define in .h file like below:
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#protocol ParseLinesFromImageDelegate<NSObject>
#required
-(void) sucess:(nullable NSDictionary*)info;
-(void) failed:(nullable NSError*) error;
#end
#interface ParseLinesFromImage: NSObject
#property (nonatomic, weak, nullable) id <ParseLinesFromImageDelegate> delegate;
- (void) performRecognitionWithImage:(UIImage* _Nonnull)image;
#end
But when running to line marked as 1, system push an exeption
"Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImage g8_blackAndWhite]: unrecognized selector sent to instance 0x60c0000b9e00'"
In my view it may be an ambiguous between UIImage+G8Filters.h(define g8_blackAndWhite) and UIImage but I look into TesseractOCR example, it's the same as mine.
Please help me to find out the reason and how to fix it, thanks.
PS: Thanks you for reading my question, after google and follow answer from https://github.com/gali8/Tesseract-OCR-iOS/wiki/Installation (side note), the issue goes away and in my case, I added _all-load to my project.