执行命令提示：java.io.FileNotFoundException: monkey/build/libs/monkey.jar

在执行 ~/Library/Android/sdk/build-tools/28.0.3/dx --dex --output=monkeyq.jar monkey/build/libs/monkey.jar 命令是，提示以下内容

UNEXPECTED TOP-LEVEL EXCEPTION:
java.io.FileNotFoundException: monkey/build/libs/monkey.jar (No such file or directory)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.(ZipFile.java:225)
at java.util.zip.ZipFile.(ZipFile.java:155)
at java.util.zip.ZipFile.(ZipFile.java:169)
at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:244)
at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:165)
at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:143)
at com.android.dx.command.dexer.Main.processOne(Main.java:678)
at com.android.dx.command.dexer.Main.processAllFiles(Main.java:575)
at com.android.dx.command.dexer.Main.runMonoDex(Main.java:310)
at com.android.dx.command.dexer.Main.runDx(Main.java:288)
at com.android.dx.command.dexer.Main.main(Main.java:244)
at com.android.dx.command.Main.main(Main.java:95)
1 error; aborting