Need help with the array of jasperreport

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I have a report that is I need to create a xy chart with. I have done several charts and have not come back with this error.

The report compiles fine. When I execute the chart within the application I get the following error:

Null 'orientation' argument


i was having same issue. My problem was that i had old version of jasperreport.jar on my classpath. Verify your jars