Sorry, I copied the wrong error message. But the right one is basically the same:
ERROR ITMS-90240: “Unsupported Architectures. Your executable contained the following disallowed architectures: ‘[i386 (in com.tigercreate.mac.moviepuzzles.nature.pkg/Payload/MyMacApp-Appstore.app/Contents/Plugins/PreciseLocaleOSX.bundle/Contents/MacOS/PreciseLocaleOSX)]’. New apps submitted to the Mac App Store must support 64-bit starting January 2018, and Mac app updates and existing apps must support 64-bit starting June 2018.”