eclipse安装activiti报错(requires

eclipse安装activiti报错，缺少jar包。具体报错如下：Cannotcompletetheinstallbecauseoneormorerequireditemscouldnotbefound.Softwarebeinginstalled:ActivitiEclipseBPMN2.0Designer5.18.0.201508100929(org.activiti.designer.feature.feature.group5.18.0.201508100929)Missingrequirement:ActivitiEclipseBPMN2.0Designer5.18.0.201508