Webservice Error

Hi all, I am having troubles with my webservice in mendix modeler 5.17. It uses an advanced request body that maps two lists. it seems to go wrong within the mapping itself. When calling the webservice it gives an error: java.lang.ClassCastException: scala.collection.convert.Wrappers$JListWrapper cannot be cast to scala.collection.immutable.List   Does anybody have experience with this type of error?    
1 answers

I have never seem this message and it seems a Mendix Core exception to me. The forum people can not fix this for you. You can make a project that reproduces this behaviour and file a support ticket.