[android-developers] Google plugin

when i try to install google app engine plugin for eclipse it keeps
giving below error message at about 47%

"installing software has encountered a problem. An error occured while
collecting items to be installed"
An error occurred while collecting items to be installed
session context was:(profile=SDKProfile,
phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=,
action=).
Unable to read repository at
http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gdt.eclipse.appsmarketplace_2.5.1.v201201120043-rel-r37.jar.
Read timed out
Unable to read repository at
http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gwt.eclipse.sdkbundle_2.4.0.v201201120043-rel-r37.jar.
Read timed out

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