If you check the node-red log on startup, you'll see a message like this:
21 Jul 17:13:20 - [warn] [node-red-node-rbe/rbe] 'rbe' already registered by module node-red
As per the release notes for the 2.0 release, we've moved the RBE node into the core palette, so the node-red-node-rbe module doesn't need to be installed anymore.
The [object Object]
message is a bug in rendering the error message in the UI. We'll get that fixed.