getting errors while installing new update of titanium

below is the error

Error encountered during update
An error occurred while uninstalling
session context was:(profile=profile, phase=org.eclipse.equinox.internal.p2.engine.phases.Uninstall, operand=[R]com.appcelerator.titanium.feature.rcp_root 3.2.0.201312191547-837YFA-FFBdWI6jz0uTLUC7DA08H --> null, action=org.eclipse.equinox.internal.p2.touchpoint.natives.actions.CleanupzipAction).
Backup of file /Volumes/Titanium Studio/Titanium Studio/configuration/.settings/org.eclipse.equinox.p2.metadata.repository.prefs failed.
File that was copied to backup could not be deleted: /Volumes/Titanium Studio/Titanium Studio/configuration/.settings/org.eclipse.equinox.p2.metadata.repository.prefs