Get erro while creating VDC using XML-RPC API

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Getting the error while creating VDC using XML-RPC API. Here are the details

Requesting data to create VDC

<?xml version="1.0"?>
<methodCall>
<methodName>one.vdc.allocate</methodName>
<params>
<param>
<value><string>username:password</string></value>
</param>
<param>
<value><string>sushil-more-vdc</string></value>
</param>
</params>
</methodCall>

Response from server

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
    <params>
        <param>
            <value>
                <array>
                    <data>
                        <value>
                            <boolean>0</boolean>
                        </value>
                        <value>
                            <string>[one.vdc.allocate] Parse error: syntax error, unexpected VARIABLE, expecting EQUAL or EQUAL_EMPTY at line 912537907, columns 8:12</string>
                        </value>
                        <value>
                            <i4>8192</i4>
                        </value>
                        <value>
                            <i4>-1</i4>
                        </value>
                        <value>
                            <i8>-1</i8>
                        </value>
                    </data>
                </array>
            </value>
        </param>
    </params>
</methodResponse>

Please help me here if I am doing something wrong.