Hello, all
I tried to install S2AP tool as described in programmer's guide and got following error in Eclipse update tool :
Requested operation cannot be performed because it would invalidate the current configuration. See details for more information.
SpringSource Tool Suite AP Tools (1.0.0.v200807252158) requires plug-in "org.springframework.ide.eclipse.core (2.1.0)", or later version.

Could anyone help me?

Thanks in advance.