Problem with Eclipse Galileo

Hello!  Plz help me. When i try to set up Apache Geronimo Server
Adapter 2.1 in Eclipse Galileo i got the following error:

Cannot complete the install because one or more required items could
not be found.
Software being installed: Geronimo v2.1 Server Adapter 2.1.4
(org.apache.geronimo.v21.feature.feature.group 2.1.4)
Missing requirement: Geronimo v2.1 Server Adapter 2.1.4
(org.apache.geronimo.v21.feature.feature.group 2.1.4) requires
'org.eclipse.jst.common_core.feature.feature.group
2.0.0.v200706041905-1007w311817231426' but it could not be found

How to solve this problem?

--
Ivan Babanin