problems with GWT plugin for eclipse.

Hallo.
Sorry for my bad english.
I'm using eclipse Galileo on a debian linux system AMD64.
I've followed the example StoWatcher application to start with GWT but
when I run it I receive this error message:

Exception in thread "main" java.lang.UnsatisfiedLinkError: /home/mauro/
eclipse/plugins/
com.google.gwt.eclipse.sdkbundle.linux_1.7.0.v200907291526/gwt-
linux-1.7.0/libswt-pi-gtk-3235.so: /home/mauro/eclipse/plugins/
com.google.gwt.eclipse.sdkbundle.linux_1.7.0.v200907291526/gwt-
linux-1.7.0/libswt-pi-gtk-3235.so: wrong ELF class: ELFCLASS32
(Possible cause: architecture word width mismatch).

Why this problem?
Thank you.

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