Problem during Compiling Plugin for JOSM

[Volodia EL AZIMANI]

Hey,

I'm a Java "novice" who wants to create a plugin button for JOSM. I follow
the instructions on
https://josm.openstreetmap.de/wiki/DevelopersGuide/DevelopingPlugins but
when I want to compile the plugin with Eclipse using Ant, I have an error
message:

BUILD FAILED
C:\Users\velazimani\Desktop\JOSM\MyPlugin\build-common.xml:79: Class not
found: com.google.errorprone.ErrorProneAntCompilerAdapter

After hours of search about this error, I can't find a solution to compile
my plugin.
Have-you got some tips or suggestions?

Thank you very much and Happy New Year! :)