Cannot run on Mac OS Mojave

Created by: yunfei-teng

Hi,

I am a very beginner of game design and was trying to run the codes in xcode of Mac OS, but got the following error

2019-01-24 22:12:41.254993-0500 Game-mac[5171:147185] [Game-mac] CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-01-24 22:12:41.255982-0500 Game-mac[5171:147185] [Game-mac] CGContextGetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-01-24 22:12:41.256014-0500 Game-mac[5171:147185] [Game-mac] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-01-24 22:12:41.256025-0500 Game-mac[5171:147185] [Game-mac] CGContextFillRects: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 2019-01-24 22:12:41.256034-0500 Game-mac[5171:147185] [Game-mac] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. Program ended with exit code: 0

Any idea for this please? Thank you.