Remove the error
objc[829]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java (0x10dc154c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x10f44e4e0). One of the two will be used. Which one is undefined.
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I am using macOs high sierra version 10.13.1
same problem
Same problem running macOS Sierra.
Check your Java version, and see
https://stackoverflow.com/questions/43003012/class-javalaunchhelper-is-implemented-in-two-places/43003231#43003231
For me I realized that my JDK was version 111 (type "javac -version"), even though my JRE (e.g., what you see in the Preferences pane) was version 161.
This is just a warning; it does not prevent execution of your program.