I came across this error today after updating a domain and republishing the layers. I am having issues troubleshooting this issue as each time Field Maps is opened it generates the error on different layers. I thought I found the solution when I saw one specific domain was giving errors in Field Maps Designer, however upon correcting that domain I am still experiencing the error. In the pictures below you can see Secondary Stub-Out is fine in one and giving me the error in the next. The only thing that changed between these screenshots is I cleared out of Field Maps and reopened it.
I also am getting generic error code 500 in my logs in Field Maps. We are on enterprise 11.3 and field maps 25.3.0. Any help would be appreciated!
