Error code 500, error performing execute operation from Print task of ArcGIS API for

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I'm trying to use print task to generate a PNG or PDF file of my web map but i always get an Error code 500, error performing execute operation.

Any Ideas?

I'm using ArcGIS API for JavaScript 3.2.0

var dojoConfig = { async : true };on(dom.byId("png"),'click', function () {printTaskSetup("MAP_ONLY", "png32");})on(dom.byId("landscape"),'click', function () {printTaskSetup("A4 Landscape", "PDF");})on(dom.byId("portrait"),'click', function () {printTaskSetup("A4 Portrait", "PDF");})function printTaskSetup(layout, format){var template = new esri.tasks.PrintTemplate(template.format = format;template.layout = layout;template.layoutOptions = { "scalebarUnit": "Miles", "copyrightText": "Clerk", "showAttribution": false}template.preserveScale = true;var params = new esri.tasks.PrintParameters();params.map = map;params.template = template;printTask = new esri.tasks.PrintTask(print URL, dojoConfig);printTask.submitJob(params, printResult, printError);}function printResult(result) { window.open(result.url)}function printError(error) { alert(error);}

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