checkMwOrGeFeasibility API is failing

Request :
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://server.internal.api.srd.nep.mobinets.com/">
<soapenv:Header/>
<soapenv:Body>
<ser:checkMwOrGeFeasibility>
<!-Optional:->
<requestId>821</requestId>
<!-Optional:->
<serviceName>1319442_FBB</serviceName>
<!-Optional:->
<siteLat>23.55626893321905</siteLat>
<!-Optional:->
<siteLong>58.21754375406719</siteLong>
<!-Optional:->
<maxDistanceInMeters>30.0</maxDistanceInMeters>
<!-Optional:->
<coordinateFormat>geo_wgs84</coordinateFormat>
<!-Optional:->
<bandWith>10</bandWith>
<!-Optional:->
<nbLines>10</nbLines>
<!-Optional:->
<nbChannels>10</nbChannels>
</ser:checkMwOrGeFeasibility>
</soapenv:Body>
</soapenv:Envelope>

Response:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>eq(null) is not allowed. Use isNull() instead</faultstring>
<detail>
<ns1:NepFault xmlns:ns1="http://server.internal.api.srd.nep.mobinets.com/">
<errorCode xmlns:ns2="http://server.internal.api.srd.nep.mobinets.com/">-1</errorCode>
</ns1:NepFault>
</detail>
</soap:Fault>
</soap:Body>
</soap:Envelope>