the requested resource () is not available

hi people,
i've searched about it and i couldn't find anything. When i call an
RPC i get this message "the requested resource (/kaan/service) is not
available".
I am using tomcat5 on linux with virtual hosting. the tomcat directory
for this host "/home/kaan/tomcat" . and i am not copying .war file. i
copy the whole war directory not zipped.
it was working a few days ago and i beleive i haven't changed
anything.
my servlet setting is like this:
<servlet>
<servlet-name>serviceImpl</servlet-name>
<servlet-class>com.kaan.server.ServiceImpl</servlet-class>

</servlet>
<servlet-mapping>
<servlet-name>serviceImpl</servlet-name>
<url-pattern>/kaan/service</url-pattern>
</servlet-mapping>

any idea?

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