Upgrade fails with unhelpful error message

[electrum]

This error seems to be caused by the artifact not existing in the repository:

[21:50 ubuntu@i-64580004:~ prod] galaxy upgrade -u 458e 1.7
uuid  host         machine     status   binary                                 config              
458e  10.94.13.48  i-4c451d2c  RUNNING  phish-dashboard:1.7-20120419.172120-1  @phish-dashboard:4

Are you sure you would like to UPGRADE these servers? [y/N] y

UnexpectedResponseException{request=Request{uri=http://127.0.0.1:64000/v1/slot/assignment?uuid=458ec7ab-7335-42bc-b799-54f537b00900, method='POST', headers={x-galaxy-slots-version=[519939dd16afc784c8afaf6500468f0f], Content-Type=[application/json]}, bodyGenerator=com.proofpoint.http.client.JsonBodyGenerator@14a8e586}, statusCode=500, statusMessage='Can not upgrade binary com.proofpoint.anomalytics:phish-dashboard:1.7-20120419.172120-1 to 1.7', headers={Content-Length=[1455], Content-Type=[text/html;charset=ISO-8859-1], Cache-Control=[must-revalidate,no-cache,no-store]}}