I have a maven project where I use groovy files for unit testing (Spock). I didn't change anything except update groovy-eclipse feature to 2.9.2.xx-201702030026-e46. Since then the project can't be build because of "The project was not built since its build path is incomplete. Cannot find the class file for groovy.lang.GroovyObject. Fix the build path then try building this project".

My system description:
Windows 10 x64
jdk 1.8.0_121
Eclipse 4.6.2