i just started using Jaspersoft Studio. Now i want to edit my old (v5.5.0) Reports.
In one of the Reports i have three subreports and there is one pie chart in every subreport. I am using a XML-File as Datasource. But if i want to preview my report, i get the error:"
net.sf.jasperrepors.engine.JRRuntimeException: Key 0 is duplicated in pie dataset."
How can i fix this? Or to get started a little easier, what is Key 0?