This issue occurs after running a build that updates the RubyGems gem. You will need to push a manual deployment with a clear build cache. I guess that for some reason, the psych gem’s native bindings haven’t been previously built. The update to RubyGems is now causing this to be used/checked, and you get this error. Clearing the build cache forces the native binding to be built as the gem is reinstalled.
Greatly appreciate that comment, I’m going to try it out. Is there a link you can point me to on how to do the manual deployment with a clear build cache option?