Bart posted a comment on ticket #24

I get the same error in Eclipse CDT, Version: 2018-09 (4.9.0) Build id: 20180917-1800. The workaround that worked for me was to manually download the files and put them in the dropins-folder. More details: https://mcuoneclipse.com/2017/07/26/embsysregview-0-2-6-for-eclipse-neon-and-oxygen/ but instead of putting the files in the plugins folder, put them in dropins, as mentioned in the comments.