New Message: Problem with posting by API

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A new message was posted:

Address: http://manila.userland.com/discuss/msgReader$2234

By: kostya (kostya_fed2 at mail.ru)

I'm trying to make new post, using api
Send POST request to server (http://www.manilasites.com/rpc2)
with xml{
<?xml version="1.0" ?>

<methodCall> <methodName>manila.message.create</methodName>
 <params>
 <param>
 <value>
 <string>my at email.here</string>
 </value>
 </param>
 <param>
 <value>
 <string>pass***</string>
 </value>
 </param>

 <param>
 <value> <string>http://www.manilasites.com/jetistyum</string>
 </value>
 </param>
 <param>
 <value>
 <string>My TEST API post for News #2007-01-10 12:38:01</string>
 </value>
 </param>
 <param>
 <value>
 <string>My Test message2007/01/10 12:38:01</string>
 </value>
 </param>
 <param>
 <value>
 <string>text/plain</string>
 </value>
 </param>
 <param>
 <value>
 <string>What should i put here?</string>
 </value>
 </param>
 <param>
 <value>
 <string>0</string>
 </value>
 </param>

 <param>
 <value>
 <string>0</string>
 </value>
 </param>

 </params>
</methodCall>

}

But server returns message like "
faultString
Can't evaluate the expression because the name "http://www.manilasites.com/jetistyum" hasn't been defined

Whats wrong???
I'm novice in XMLRPC.. so perhaps made some mistakes.
Can somebody help me to resolve this problem?

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