Hi,

I've just installed Workflow Manager 1.0 on our Dev WFE SharePoint 2013 server, following instructions from TechNet and blogs. Everything went well, registered site collection with workflow farm, verified the Workflow Service Application Proxy is in connected status and the 2013 Workflow choice shows up in the dropdown list when creating a new workflow in SP Designer. We have one App server, one WFE server in the DEV farm by the way and I'm just using the WFE server for workflow farm. However, after we make a workflow on a list and when clicking the ellipses on the workflow item and clicking workflows on the dropdown to open workflows on the item, it gives the following error.

I've searched online for solutions and was not able to find any. If you have any suggestions or ideas on solving this, it would be greatly appreciated! Thanks!