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error while calling my jasper report from my servlet

 
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I am new to the concept of reporting and i am having trouble calling the report from my servlet. I have create a report that displays the marks of the sdudents and a subreport that displays the average of each student.The code for my report is :


and the code for my sub report AverageSub is:



and the code of my servlet calling the main jasper report is:



Both the main report and the sub report .jrxml files are in my web-inf folder but he error i keep getting is:
Exceptiionnet.sf.jasperreports.engine.JRException: Resource not found at: AverageSub.jasper where AverageSub.jasper is my subreport name.

Please guys i need your help i have to present this to my teacher by tomorrow.Thank you !!
 
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