The IDEA plugin team has made a small release that fixes some immediate issues and updates the project to support IDEA 2018.1. Hope you enjoy it.
The release notice is here: Version 1.0.1 has been released. - IntelliJ-Haxe
As always, if you regularly use this product, please become a Patron of the maintainers: Eric Bishton is creating the Haxe plugin for IntelliJ IDEA | Patreon, and https://www.patreon.com/mayakwd.