I use Eclipse 4.7 (Oxygen), portable version
The plugin has been updated (version 2.5) to work with Eclipse Oxygen and Gradle 2+. Install the new plugin (it will uninstall the old one) and it'll work again. See here for details.
i had the same error with Neon and it all boiled down to an exception i saw in the .log
File of eclipse ({yourWorkspace}.metadata).
java.lang.ClassNotFoundException: org.eclipse.buildship.core.workspace.SynchronizeGradleProjectJob cannot be found by com.gluonhq.eclipse.plugin_2.4.0
It seems version 2.x of Buildships Gradle has rearranged its packages and contents making the finish button unclickable.
I downloaded the latest 1.x version from an updatesite which can be found on github and everything runs just fine.
Hope this helps,
Bests!
Firstly, sorry for my english.
I was having the same problem as the guillaume girod-vitouchkina. I could not create a new Gluon project. I was using Eclipse Neon.2 and update for Eclipse Neon.3 and the problem persisted. So I did what uBreckner recommended and it worked! I uinstall version 2.x of Buildships Gradle and install latest 1.x version.
Thanks guys,
Regards!