i tried to install the Eclipse designer as it described in the Activiti User Guide: http://activiti.org/userguide/index.html#N10E03 but i had no success! The Error is: "Cannot complete the install because one or more required items could not be found. Software being installed: Activiti Eclipse BPMN 2.0 Designer 0.5.0 (org.activiti.graphiti.bpmn.feature.feature.group 0.5.0)" Please help!