This issue has been solved after the AEM author instance port has been removed from External accounts configuration.

Hi,Any updates? How did you solve the issue?I'm getting the following error as well:-60-60SOP-330011 Error while executing the method 'GetAEMContentList' of service 'nms:delivery'.XTK-170006 Unable to parse expression 'GetAEMContentList($(labelFilter) , $(approvedFilter) , $(linkedFilter) , $(_order) , $(_lineCount) , $(_lineStart))'.XTK-170006 Unable to parse expression 'GetAEMContentList($(labelFilter) , $(approvedFilter) , $(linkedFilter) , $(_order) , $(_lineCount) , $(_lineStart))'.