ajax4jsf 1.1 RC2 - session serialization write error

[SOSELLA]

I just downloaded and imported version 1.1 rc2 of AJAX4JSF (from a
version I downloaded sometime in Dec. 2006).  I am now getting a
'Session Serialization Error' when stopping my Tomcat server.  I know
you can turn off Session Serialization, but does anyone anything in
particular that might be causing this exception?