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java.lang.NullPointerException: null	at si.mazi.rescu.Params.toString(Params.java:181)	at si.mazi.rescu.Params.iterableToString(Params.java:190)	at si.mazi.rescu.Params.toString(Params.java:171)	at si.mazi.rescu.Params.getParamValueAsString(Params.java:164)	at si.mazi.rescu.Params.asHttpHeaders(Params.java:156)	at com.currencycloud.client.exception.CurrencyCloudException.setInvocation(CurrencyCloudException.java:62)	at com.currencycloud.client.exception.CurrencyCloudException.(CurrencyCloudException.java:54)	at com.currencycloud.client.exception.UnexpectedException.(UnexpectedException.java:8)	at com.currencycloud.client.ExceptionTransformer.aroundInvoke(ExceptionTransformer.java:23)	at si.mazi.rescu.InterceptedInvocationHandler.invoke(InterceptedInvocationHandler.java:42)	at com.currencycloud.client.Reauthenticator.aroundInvoke(Reauthenticator.java:23)	at si.mazi.rescu.InterceptedInvocationHandler.invoke(InterceptedInvocationHandler.java:42)	at com.sun.proxy.$Proxy20.createBeneficiary(Unknown Source)	at com.currencycloud.client.CurrencyCloudClient.createBeneficiary(CurrencyCloudClient.java:283)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:180)	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)	at org.apache.cxf.jaxrs.validation.JAXRSBeanValidationInvoker.invoke(JAXRSBeanValidationInvoker.java:51)	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:200)	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:99)	at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59)	at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96)	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308)	at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)	at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:251)	at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234)	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208)	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160)	at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:180)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:293)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:212)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:268)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:837)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)	at org.eclipse.jetty.server.Server.handle(Server.java:518)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:186)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)	at java.lang.Thread.run(Thread.java:745)