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activiti diagram editor can not work

Question asked by yhxjldx on Mar 14, 2012
Latest reply on Mar 14, 2012 by yhxjldx
I have installed Activiti BPMN 2.0 designer by eclipes hellp->install new software. but activiti diagram editor can not work.
XML info :
<?xml version="1.0" encoding="UTF-8"?>
<definitions id="definitions"
<process id="helloWorld">
<startEvent id="start" />
<sequenceFlow id="flow1" sourceRef="start" targetRef="script" />
<scriptTask id="script" name="HelloWorld" scriptFormat="groovy">
<script>System.out.println("Hello world")</script>
<sequenceFlow id="flow2" sourceRef="script" targetRef="theEnd" />
<endEvent id="theEnd" />
some error info like this:
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: org.eclipse.emf.ecore.xmi.PackageNotFoundException: Package with uri '' not found. (platform:/resource/testActivitinew/src/main/resources/diagrams/NewFile.xml, 4, 51)