Describe the feature
Currently if there's a merge error from fw-headless all the user sees is a 500. I would like to expose at least the exception message, and maybe even the stack trace (collapsed?), this should let us give more detailed info to the user on what went wrong, eg bad data, and then maybe they can fix it on their own.

Who is this feature for?
Project managers.

Pages affected
Project page, Fw Lite sync dialog