Obtaining details for airbrake-js error objects

Question

I use Errbit and airbrake-js

Errbit https://github.com/errbit/errbit

My Vue js errors are reported by airbrake-js to Errbit with airbrake-js.

airbrake.notify({
    error: err,
    params: {
      info: info
    }

vue errors are reported to errbit.

but MESSAGE of Errbit is like 100.0% [object Object].

How can I get details about the Object?