Hi,how to make the ipa smaller?

Launching:
art I 2786 824122 /Volumes/SSD/gh-moe-master/aosp/art/runtime/parsed_options.cc:449] setting boot class path to /var/containers/Bundle/Application/147A57CF-3167-4FE0-B828-C5AA06A6EFE5/ios-moe.app/application.jar:/var/containers/Bundle/Application/147A57CF-3167-4FE0-B828-C5AA06A6EFE5/ios-moe.app
5 Zip: Found duplicate entry android/database/CursorWindow.aidl
5 Zip: Error adding entry to hash table -5
System 6 Unable to open boot classpath entry: /var/containers/Bundle/Application/147A57CF-3167-4FE0-B828-C5AA06A6EFE5/ios-moe.app/application.jar
System 6 java.io.IOException: Duplicate entries in archive
at java.util.jar.StrictJarFile.nativeOpenJarFile(Native Method)
at java.util.jar.StrictJarFile.(StrictJarFile.java:61)
at libcore.io.ClassPathURLStreamHandler.(ClassPathURLStreamHandler.java:57)
at java.lang.VMClassLoader.createBootClassPathUrlHandlers(VMClassLoader.java:48)
at java.lang.VMClassLoader.(VMClassLoader.java:31)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:373)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:849)
at java.lang.ClassLoader.loadClass(ClassLoader.java:480)
at libcore.reflect.InternalNames.getClass(InternalNames.java:53)
at java.lang.Class.getDexCacheType(Class.java:521)
at java.lang.reflect.Method.getReturnType(Method.java:173)
at java.lang.Class.getDeclaredMethods(Class.java:717)
at org.moe.natj.objc.ObjCRuntime.registerClass(Native Method)
at org.moe.natj.objc.ObjCRuntime.doRegistration(ObjCRuntime.java:73)
at org.moe.natj.general.NatJ.register(NatJ.java:265)
at apple.NSObject.(NSObject.java:65)

I don’t understand how to do.