Packaging Error 'Use of undeclared identifier 'FFilehelper''

Hi guys

I’ve recently started developing a game for a final year uni project and have been using blueprints to begin with. I needed to save the scores in a csv file, which I couldn’t do with blueprints so I modified some c++ code I found on another forum. The code compiles successfully and I’ve got the scores to write to the file using blueprints but when I come to package the project it gives me an error 'Use of undeclared identifier ‘FFhelper’. There’s also an error in the .cpp file. Any ideas would be appreciated and I’ve attached some screenshots.