I’ve checked it out and opened it in IDEA.
Then I imported Gradle project as IDEA suggested and it was fine. I’ve not spotted anything suspicious, except ../klaxon directory mapping in .idea/vcs.xml.
Klaxon library and its sources were successfully downloaded from maven central and the references to klaxon API were resolved correctly in IDE.
I’m using IDEA 2017.2.5 with Kotlin plugin 1.1.51-release-IJ2017.2-1, my JAVA_HOME points to jdk1.8.0_144 installation.
What I’ve actually asked is to share the entire project directory with all files, including those that are ignored by git.