Today, I had the same issue today with Eclipse Photon / Atelier 1.2 installed in a Windows 10 VM  - all server connections failed with a similar error.

Looking under Help/Eclipse Marketplace, Tab "Installed", EGit was asking for an update.

Installed it, restarted Eclipse and now things are working again.

Hello Sergey,  typo indeed. Thank you for your feedback!

This tool is very handy when trying to understand complex class hierarchies - especially because it works dynamically. One thing that would make it even more useful would be the possibility to display the list of Includes for classes. Any chance of implementing this?