Soap UI "Unknown" fault string, "soapenv:Server" fault code

Hi all, I am getting this fault response in Soap UI

<faultcode>soapenv:Server</faultcode>
<faultstring>unknown</faultstring>

My service is running fine when I test it in my local machine, but it is not giving any response (as expected) in the server when I upload my service.

I am using Axis2 and made a .aar of my service and deployed it on the Linux server. Specified the wsdl link in Soap UI as end point and testing.

Please help me find the problem.

Thanks,
Venkat.