Exception while running STS Client from WSO2 Identity Server - axis2

Question

I am new to WebServer Security and STS. I need to secure web services. My first target is to get the samples running.
As such I downloaded the STS-CLIENT from
svn co http://svn.wso2.org/repos/wso2/carbon/platform/branches/turing/products/is/5.0.0/modules/samples/sts/
as given in : https://docs.wso2.com/display/IS500/Running+an+STS+Client
I can get the token from Identity Server. Then I try to invoke a 'echoString' service hosted in Tomcat.
But in tomcat , I get the following exception :
[ERROR] General security error (WSSecurityEngine: No crypto property file supplied for decryption)
org.apache.axis2.AxisFault: General security error (WSSecurityEngine: No crypto property file supplied for decryption)
at org.apache.rampart.handler.RampartReceiver.setFaultCodeAndThrowAxisFault(RampartReceiver.java:180)
at org.apache.rampart.handler.RampartReceiver.invoke(RampartReceiver.java:95)
at org.apache.axis2.engine.Phase.invokeHandler(Phase.java:340)
at org.apache.axis2.engine.Phase.invoke(Phase.java:313)
at org.apache.axis2.engine.AxisEngine.invoke(AxisEngine.java:262)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:168)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
Any help will be appreciated a lot.
<?xml version="1.0" encoding="UTF-8"?>
<service name="sample05">
<operation name="echoString">
<messageReceiver class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
</operation>
<parameter name="ServiceClass" locked="false">org.apache.rampart.samples.policy.sample05.SimpleService</parameter>
<module ref="rampart" />
<module ref="addressing" />
<wsp:Policy wsu:Id="SgnEncrAnonymous" xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy"
xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<wsp:ExactlyOne>
<wsp:All>
<sp:SymmetricBinding xmlns:sp="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy">
<wsp:Policy>
<sp:ProtectionToken>
<wsp:Policy>
<sp:X509Token
sp:IncludeToken="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy/IncludeToken/Never">
<wsp:Policy>
<sp:RequireThumbprintReference/>
<sp:WssX509V3Token10/>
</wsp:Policy>
</sp:X509Token>
</wsp:Policy>
</sp:ProtectionToken>
<sp:AlgorithmSuite>
<wsp:Policy>
<sp:Basic256/>
</wsp:Policy>
</sp:AlgorithmSuite>
<sp:Layout>
<wsp:Policy>
<sp:Lax/>
</wsp:Policy>
</sp:Layout>
<sp:IncludeTimestamp/>
<sp:OnlySignEntireHeadersAndBody/>
</wsp:Policy>
</sp:SymmetricBinding>
<sp:SupportingTokens xmlns:sp="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy">
<wsp:Policy>
<sp:IssuedToken
sp:IncludeToken="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy/IncludeToken/AlwaysToRecipient">
<sp:Issuer>
<Address xmlns="http://www.w3.org/2005/08/addressing">https://localhost:9443/services/wso2carbon-sts</Address>
</sp:Issuer>
<sp:RequestSecurityTokenTemplate>
<t:TokenType xmlns:t="http://schemas.xmlsoap.org/ws/2005/02/trust">urn:oasis:names:tc:SAML:2.0:assertion</t:TokenType>
<t:KeyType xmlns:t="http://schemas.xmlsoap.org/ws/2005/02/trust">http://schemas.xmlsoap.org/ws/2005/02/trust/Bearer</t:KeyType>
<t:KeySize xmlns:t="http://schemas.xmlsoap.org/ws/2005/02/trust">256</t:KeySize>
<t:Claims Dialect="http://wso2.org/claims"
xmlns:t="http://schemas.xmlsoap.org/ws/2005/02/trust"
xmlns:ic="http://schemas.xmlsoap.org/ws/2005/05/identity">
<ic:ClaimType Uri="http://wso2.org/claims/givenname"/>
<ic:ClaimType Uri="http://wso2.org/claims/emailaddress"/>
</t:Claims>
</sp:RequestSecurityTokenTemplate>
<wsp:Policy>
<sp:RequireInternalReference/>
</wsp:Policy>
</sp:IssuedToken>
</wsp:Policy>
</sp:SupportingTokens>
</wsp:All>
</wsp:ExactlyOne>
</wsp:Policy>
</service>