RPC callback fails: status code 0

Hi all.

I did the Stockwatcher RPC tutorial and it worked beautifully. I then
implemented my own very simple RPC callback for my own project and I
always get status code 0 returned... the callback always fails. Funny
thing is that the server method does indeed run, I debugged into it.
Only the client side seems to think the RPC callback fails. My
implementation is even more simple than the Stockwatcher RPC because I
am simply returning a Long, which is serializable.

I discovered a thread mentioning that RPC doesn't quite work with App-
engine, so I created a new project without app-engine, copied all my
code and files over to that project and I still have the same result.

I don't know what else to tell you to help me out here. I have studied
the RPC guide and am sure I've implemented it all correctly, including
the web.xml file. Not to mention the fact that the server code DOES
run.

Thanks for any insight.

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