Getting Below error while trying to connect simulation server with java client

* Running in EVALUATION mode
* Connections will close after 119 minutes

log4j:WARN No appenders could be found for logger (com.prosysopc.ua.UaApplication).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4…..l#noconfig for more info.
Exception in thread “main” java.lang.NoClassDefFoundError: org/bouncycastle/operator/OperatorCreationException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.prosysopc.ua.stack.utils.CertificateUtils.getCertificateProvider(SourceFile:510)
at com.prosysopc.ua.stack.utils.CertificateUtils.decodeX509Certificate(SourceFile:440)
at com.prosysopc.ua.stack.transport.security.Cert.(SourceFile:85)
at com.prosysopc.ua.client.UaClient.at(SourceFile:6246)
at com.prosysopc.ua.client.UaClient.connect(SourceFile:1006)
at com.prosysopc.ua.samples.client.SimpleClient.main(SimpleClient.java:33)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.operator.OperatorCreationException
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
… 8 more