Accessing to non-default version apps get persistent 500 Errors

[Makoto Kameyama]

We are in trouble getting many 500 errors.
Only our default version app seems to be fine.
But our non-default version apps get many 500 errors.
The response we can get from non-default version app is follows:

The server encountered an error and could not complete your
request.<p>If the problem persists, please <A
HREF="http://code.google.com/appengine/community.html">report</A> your
problem and mention this error message and the query that caused it.

And the log is follows:

A problem was encountered with the process that handled this request, causing it to exit. This is likely to cause a new process to be used for the next request to your application. (Error code 121)

We have been in this trouble for 5 hours.
Please help us ASAP.

App info:
 app-id: fraud-buster

 Java,HRD

Thanks.

Makoto Kameyama
Cacco Inc.