What is the correct way to interrupt/stop ksp proc...

# ksp

[Norbi]

What is the correct way to interrupt/stop ksp processing with a friendly compiling error message when an error is detected "deeply" during processing?
If I throw an exception it causes an internal compiler error.
Thanks.

[Grégory Lureau]

I'm using environment.logger.error("An error message", classDeclaration) , warn is logged but don't fail the build, error does.