Bizagi to Camunda Export

I created a simple process in Bizagi Modeler and imported it t without issues to bpmn.io.
After change it in bpmn.io, I saved it and tried to load the exported file. I got this ERROR:

unparsable content detected
line: 2
column: 78
nested error: unknown type dc:Process

unparsable content detected
line: 3
column: 56
nested error: unknown type dc:Process

unparsable content detected
line: 60
column: 79
nested error: unknown type dc:Collaboration

unparsable content detected
line: 83
column: 65
nested error: unknown type dc:BPMNDiagram

Some details on the diagram export would be helpful (give us some actual XML). The error message as such says nothing.