Packaging for Mac computers Problems

I have a game that is available for windows but I want to try and get it available for mac computers as well. I do not own a mac so it makes it difficult but while borrowing one just to see what and if there would be errors I could not even get to opening the project file. Here are some issues I faced while opening the project file.

After rebuilding we got this error.

Any ideas what we are doing wrong? The person who helped me does have xcode on the mac. Also does anybody work with mac on unreal engine I may need more assistance so please contact me.

its a simple c++ error. not difficukt to fix. but could be time comsuming. we need to check your c++ codes and plugins also