Random Recommendation is not working

[Habush]

I am trying to get random recommendations for users with no relations with other users. The code that does this random recommendation is as follows:

public class RandomUser extends RandomRecommendations{
    
    @Override
    public String name(){
        return "random";
    }

    protected NodeInclusionPolicy getPolicy() {
        return new BaseNodeInclusionPolicy() {
            @Override
            public boolean include(Node node) {
                return node.hasLabel(Label.label("User"));
            }
        };
    }

    public ParticipationPolicy<Node, Node> participationPolicy(Context context) {
        return ParticipationPolicy.IF_MORE_RESULTS_NEEDED_AND_ENOUGH_TIME;
    }


}

When running unit tests the random recommendation works perfectly. However, when I use it an unmanaged extension on Neo4j Server, I get the following error trying to get random recommendations:

> 2017-06-30 15:14:21.585+0000 ERROR The exception contained within MappableContainerException could not be mapped to a response, re-throwing to the HTTP container com.graphaware.runtime.walk.RandomNodeSelector.<init>(Lcom/graphaware/common/policy/inclusion/NodeInclusionPolicy;)V
> java.lang.NoSuchMethodError: com.graphaware.runtime.walk.RandomNodeSelector.<init>(Lcom/graphaware/common/policy/inclusion/NodeInclusionPolicy;)V
> 	at com.graphaware.reco.neo4j.engine.RandomRecommendations.<init>(RandomRecommendations.java:41)
> 	at com.stavimer.recoengine.RandomUser.<init>(RandomUser.java:26)
> 	at com.stavimer.recoengine.FriendsComputingEngine.engines(FriendsComputingEngine.java:30)
> 	at com.graphaware.reco.generic.engine.DelegatingRecommendationEngine.<init>(DelegatingRecommendationEngine.java:43)
> 	at com.graphaware.reco.generic.engine.TopLevelDelegatingRecommendationEngine.<init>(TopLevelDelegatingRecommendationEngine.java:56)
> 	at com.graphaware.reco.neo4j.engine.Neo4jTopLevelDelegatingRecommendationEngine.<init>(Neo4jTopLevelDelegatingRecommendationEngine.java:26)
> 	at com.stavimer.recoengine.FriendsComputingEngine.<init>(FriendsComputingEngine.java:25)
> 	at com.stavimer.recoengine.UserRecommendation.<init>(UserRecommendation.java:44)
> 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
> 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
> 	at java.lang.reflect.Constructor.newInstance(Unknown Source)
> 	at com.sun.jersey.server.spi.component.ResourceComponentConstructor._construct(ResourceComponentConstructor.java:253)
> 	at com.sun.jersey.server.spi.component.ResourceComponentConstructor.construct(ResourceComponentConstructor.java:233)
> 	at com.sun.jersey.server.impl.resource.PerRequestFactory$PerRequest._getInstance(PerRequestFactory.java:182)
> 	at com.sun.jersey.server.impl.resource.PerRequestFactory$AbstractPerRequest.getInstance(PerRequestFactory.java:144)
> 	at com.sun.jersey.server.impl.application.WebApplicationContext.getResource(WebApplicationContext.java:239)
> 	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
> 	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
> 	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
> 	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
> 	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
> 	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
> 	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
> 	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
> 	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
> 	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
> 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)
> 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
> 	at org.neo4j.server.rest.dbms.AuthorizationEnabledFilter.doFilter(AuthorizationEnabledFilter.java:122)
> 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
> 	at org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)
> 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
> 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
> 	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
> 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
> 	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> 	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
> 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
> 	at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)
> 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
> 	at org.eclipse.jetty.server.Server.handle(Server.java:497)
> 	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
> 	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
> 	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
> 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
> 	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
> 	at java.lang.Thread.run(Unknown Source)
> ```

What could be the source of this problem? How can I solve it