Eclipse is giving an error when trying to refactor a method's signature

Eclipse is giving an error when trying to refactor a method's signature

Whenever I try to change a method's signature using eclipse refactoring
functionality (shortcut Shift+Alt+c) I get an error dialog with the text
below.
An unexpected exception occured while performing the refactoring. See the
error log for more details
org/springframework/ide/eclipse/ui/editor/util/BeansEditorUtils
I'm not sure where the error log is located to provide additional
information.
I'm running the following version of eclipse: Version: Juno Release Build
id: 20120614-1722
looking at the "for more details" it sounds that the error could be caused
by the SpringIDE plugin. I have the version: 3.3.0.201307091516-RELEASE
If you need me to provide additional details please ask and tell me where
I could find them.
Thanks a lot