java - 在 Eclipse 中安装市场时出错；

Question

错误如下；

Cannot complete the install because one or more required items could not be found.
  Software being installed: Marketplace Client - Source 1.1.1.I20110907-0947 (org.eclipse.epp.mpc.source.feature.group 1.1.1.I20110907-0947)
  Missing requirement: Marketplace Client - Source 1.1.1.I20110907-0947 (org.eclipse.epp.mpc.source.feature.group 1.1.1.I20110907-0947) requires 'org.eclipse.equinox.p2.discovery.feature.feature.group [1.0.0.v201004,2.0.0)' but it could not be found