I am getting the following error in the log:

[1/22/18 17:51:26:296 CET] 000000ac ServletWrappe E com.ibm.ws.webcontainer.servlet.ServletWrapper service Uncaught service() exception thrown by servlet RESTDecisionService: java.lang.LinkageError: loading constraint violation: loader "com/ibm/ws/bootstrap/ExtClassLoader@37fab9ce" previously initiated loading for a different type with name "ilog/rules/res/model/IlrPath" defined by loader "com/ibm/ws/runtime/component/ResourceMgrImpl$IsolatedClassLoader@2a4ca9b5" at java.lang.ClassLoader.defineClassImpl(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:324) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:155) at java.net.URLClassLoader.defineClass(URLClassLoader.java:712) at java.net.URLClassLoader.access$400(URLClassLoader.java:93) at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1164) at java.security.AccessController.doPrivileged(AccessController.java:492) at java.net.URLClassLoader.findClass(URLClassLoader.java:595) at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:243) at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:777) at java.lang.ClassLoader.loadClass(ClassLoader.java:754) at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:134) at java.lang.ClassLoader.loadClass(ClassLoader.java:731) at com.ibm.rules.res.xu.client.internal.XUClient.createRuleEngineSession(XUClient.java:112) at ilog.rules.res.session.impl.IlrStatefulSessionBase.(IlrStatefulSessionBase.java:118) at ilog.rules.res.session.impl.IlrStatefulSessionBase.(IlrStatefulSessionBase.java:77) at ilog.rules.res.session.impl.pojo.IlrStatefulSessionPOJO.(IlrStatefulSessionPOJO.java:34) at ilog.rules.res.session.IlrPOJOSessionFactory.createStatefulSession(IlrPOJOSessionFactory.java:119) at ilog.rules.res.session.impl.IlrSessionFactoryBase.createStatefulSession(IlrSessionFactoryBase.java:159) at com.ibm.rules.htds.DecisionServiceController.getStatefulSessionBase(DecisionServiceController.java:188) at com.ibm.rules.htds.DecisionServiceController.isReferencingTopDownXOM(DecisionServiceController.java:376) at com.ibm.rules.htds.servlet.RESTDecisionServiceServlet.handleFormatsRequest(RESTDecisionServiceServlet.java:465) at com.ibm.rules.htds.servlet.RESTDecisionServiceServlet.doGet(RESTDecisionServiceServlet.java:432) at com.ibm.rules.htds.servlet.RESTDecisionServiceServlet.doGet(RESTDecisionServiceServlet.java:415) at javax.servlet.http.HttpServlet.service(HttpServlet.java:575) at javax.servlet.http.HttpServlet.service(HttpServlet.java:668) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1232) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:781) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:480) at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:136) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:97) at com.ibm.rules.htds.ResponseHeaderFilter.doFilter(ResponseHeaderFilter.java:76) at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:195) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:91) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:967) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1107) at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3928) at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:304) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1007) at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:463) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:530) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:316) at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88) at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1820) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1881)