Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I ran into this same error and fixed it by installing the proper Ruby version for OpenStudio 3.4.0, which is 2.7.2 (see compatibility matrix here). You already have that version installed, so I suspect you have 2.7.2 listed after version 2.5.8 in your environmental variables path, so it's using the incorrect version.
