Exception in running Ruby app which requiring sync.rb: uninitialized constant Sync (NameError)

[windops]

Can't run app in ruby which is using sync.rb, the exception is:
uninitialized constant Sync (NameError)

I found when run the ruby app, aptana studio will generate a "sync.rb" file in the path .eclipse/org.eclipse.platform_3.7.0_254520569/configuration/org.eclipse.osgi/bundles/86/1/.cp/ruby/, which is the first path of $LOAD_PATH