(Two months later)
Please fix bug
https://bugs.openjdk.java.net/browse/JDK-8179033
See patch below (or previous letter
http://mail.openjdk.java.net/pipermail/openjfx-dev/2017-October/020878.html)
See example on GitHub to check
https://github.com/dbelob/multiplatform-distribution
How to build
There is JDK-8179033
https://bugs.openjdk.java.net/browse/JDK-8179033
("javapackager fails to create Mac Application Bundle")
Error is reproduced on macOS and Windows
(there is no error on Linux)
Cause is the absence of a destination resource subdirectory.
I suppose that to fix the error it is
