I develope module and use soap interface to zimbra. I can create mail account without a problem. but when I try to make an appointment I found Internal Server Error reply back. It may be wrong with the parameter for create appointment. So I try "GetApptSummariesRequest" which is a complex parameter unavailable. It still reply back with "Internal Server Error". My Soap structure like this.

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<context xmlns="urn:zimbra">
<GetApptSummariesRequest s="1072224000000" e="1198368000000"/>

Is someone help me please?