FCDSL incompatible with Xtext 2.22.0
The project edu.kit.ipd.are.dsexplore.fcdsl.ide is incompatible with Xtext 2.22.0, which is shipped with Eclipse 2020-06. The build still works because the project is not built at all.
Fixing the compile error should be straight forward by regenerating the code with Xtext tooling. After that, the bundles should be added to the build. If the bundles are not used at all and not required anymore, it might be better to just remove them.
Pull request has been merged into master.
I regenerated the Xtext code and prepared a pull request.