配置如下：Eclipse Java EE IDE for Web Developers.Version: Helios Service Release 2
Build id: 20110218-0911
Name：Activiti BPMN 2.0 designer
Location：http://activiti.org/designer/update/ 为啥会报这个错误：
Cannot complete the install because one or more required items could not be found.
Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.8.0 (org.activiti.designer.feature.feature.group 5.8.0)
Missing requirement: Activiti Eclipse BPMN 2.0 Designer 5.8.0 (org.activiti.designer.feature.feature.group 5.8.0) requires 'org.eclipse.emf.transaction 1.4.0' but it could not be found
Build id: 20110218-0911
Name：Activiti BPMN 2.0 designer
Location：http://activiti.org/designer/update/ 为啥会报这个错误：
Cannot complete the install because one or more required items could not be found.
Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.8.0 (org.activiti.designer.feature.feature.group 5.8.0)
Missing requirement: Activiti Eclipse BPMN 2.0 Designer 5.8.0 (org.activiti.designer.feature.feature.group 5.8.0) requires 'org.eclipse.emf.transaction 1.4.0' but it could not be found
解决方案 »
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