Some 'Web Map As JSON' inputs fail to print with the default ArcGIS GIS Server 10.6 print service, returning the message, "Error executing tool. Export Web Map Task : Failed to create layer from service."
This issue is marked as not reproducible. If a reproducible workflow can be produced, please contact Esri Support Services with this information and the BUG number.
解决办法
Use a ArcGIS GIS Server 10.5.1 default print service.