Build Library with core Processing 4 with Java 8 failed and almost work with Java 11

[knupel]

Hello,
I try to build a library with Processing 4 core, but that's failed. Need change
#java.target.version=1.8 to java.target.version=11 in the build.properties and that's work, but not all the time, to be precise It works one out of two times and to be more precise the first build failed and the second work like a charm.

Et voilà

BEFORE

BUILD FAILED
/Users/stanislasmarcais/EN_COURS/CODE/github/ROPE_PROJECT/Rope_p5/resources/build.xml:111: The following error occurred while executing this line:
/Users/stanislasmarcais/EN_COURS/CODE/github/ROPE_PROJECT/Rope_p5/resources/build.xml:132: Unable to delete directory /Users/stanislasmarcais/Documents/Processing/libraries/Rope

AFTER

BUILD SUCCESSFUL
Total time: 9 seconds