安装ADT时，安装Android Development Tools 时报错。我的eclipse版本为3.7.2

Cannot complete the install because one or more required items could not be found.
报错信息如下： Software being installed: Android Development Tools 20.0.0.v201206242043-391819 (com.android.ide.eclipse.adt.feature.group 20.0.0.v201206242043-391819)
Missing requirement: Android Development Tools 20.0.0.v201206242043-391819 (com.android.ide.eclipse.adt.feature.group 20.0.0.v201206242043-391819) requires 'org.eclipse.wst.sse.core 0.0.0' but it could not be found

由于缺少一个或多个必备项，无法无成安装。
正在安装软件：JBossAS Tools 2.2.0.v20110303-1328-H175-Alpha1 (org.jboss.ide.eclipse.as.feature.feature.group 2.2.0.v20110303-1328-H175-Alpha1)
丢失请求：Project Archives Webtools Integration Plug-in 2.2.0.v20110303-1328-H175-Alpha1 (org.jboss.ide.eclipse.archives.webtools 2.2.0.v20110303-1328-H175-Alpha1)需要用到'bundle org.eclipse.wst.common.modulecore.ui 1.0.0' ，但无法找到。
无法满足从属软件：
从JBossAS Tools 2.2.0.v20110303-1328-H175-Alpha1 (org.jboss.ide.eclipse.as.feature.feature.group 2.2.0.v20110303-1328-H175-Alpha1)
到: org.jboss.ide.eclipse.archives.webtools 0.0.0

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