I tried installing grails extensions to STS-2.3.3-M2, and the process crapped out with the message
I forced the springsource directory and its children to be read-write (removed to read-only flag on some of the files), but that didn't help.
An error occurred while unconfiguring the items to uninstall
session context was:(profile=com.springsource.sts.ide, phase=org.eclipse.equinox.internal.p2.engine.phases.Unconfigure, operand=[R]com.springsource.sts.package.feature.group 126.96.36.199007151000-M2 --> [R]com.springsource.sts.package.feature.group 188.8.131.52008251000-M3, action=org.eclipse.equinox.internal.p2.touchpoint.natives.actions.RmdirAction).
Could not remove directory C:\Tools\springsource\sts-2.3.3.M2/dropins.
The install succeeded partially -- I have some of the grails menus available, but not others. For example, I cannot bring up the grails command window because the corresponding item is missing from the Navigate menu.
What to do?