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Signature creation failed; nested exception is: org.apache.xml.security.signature.XMLSignatureException: java.lang.NullPointerException Original Exception was java.security.SignatureException: java.lang.NullPointerException
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org.apache.ws.security.WSSecurityException: The keystore is null	at org.apache.ws.security.components.crypto.Merlin.getPrivateKey(Merlin.java:683)	at org.apache.ws.security.message.WSSecSignature.computeSignature(WSSecSignature.java:476)	at org.apache.ws.security.message.WSSecSignature.computeSignature(WSSecSignature.java:453)	at org.apache.ws.security.message.WSSecSignature.build(WSSecSignature.java:359)	at com.eviware.soapui.impl.wsdl.support.wss.entries.SignatureEntry.process(SignatureEntry.java:194)	at com.eviware.soapui.impl.wsdl.support.wss.OutgoingWss.processOutgoing(OutgoingWss.java:192)	at com.eviware.soapui.impl.wsdl.submit.filters.WssRequestFilter.filterWsdlRequest(WssRequestFilter.java:58)	at com.eviware.soapui.impl.wsdl.submit.filters.AbstractRequestFilter.filterAbstractHttpRequest(AbstractRequestFilter.java:37)	at com.eviware.soapui.impl.wsdl.submit.filters.AbstractRequestFilter.filterRequest(AbstractRequestFilter.java:31)	at com.eviware.soapui.impl.wsdl.submit.transports.http.HttpClientRequestTransport.sendRequest(HttpClientRequestTransport.java:184)	at com.eviware.soapui.impl.wsdl.WsdlSubmit.run(WsdlSubmit.java:123)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)