When i tried to add my artifactory server then its throwing the error like,
 

ERROR
A problem occurred while processing the request. Please check our bug tracker to see if a similar problem has already been reported. If it is already reported, please vote and put a comment on it to let us gauge the impact of the problem. If you think this is a new issue, please file a new issue. When you file an issue, make sure to add the entire stack trace, along with the version of Jenkins and relevant plugins. The users list might be also useful in understanding what has happened.

Stack trace

javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.http.impl.client.HttpClientBuilder.setDefaultCredentialsProvider(Lorg/apache/http/client/CredentialsProvider;)Lorg/apache/http/impl/client/HttpClientBuilder;" the class loader (instance of hudson/ClassicPluginStrategy$AntClassLoader2) of the current class, org/jfrog/build/client/PreemptiveHttpClient, and the class loader (instance of hudson/ClassicPluginStrategy$AntClassLoader2) for the method's defining class, org/apache/http/impl/client/HttpClientBuilder, have different Class objects for the type org/apache/http/client/CredentialsProvider used in the signature at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876) at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:233) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649) at org.kohsuke.stapler.Stapler.service(Stapler.java:238) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.http.impl.client.HttpClientBuilder.setDefaultCredentialsProvider(Lorg/apache/http/client/CredentialsProvider;)Lorg/apache/http/impl/client/HttpClientBuilder;" the class loader (instance of hudson/ClassicPluginStrategy$AntClassLoader2) of the current class, org/jfrog/build/client/PreemptiveHttpClient, and the class loader (instance of hudson/ClassicPluginStrategy$AntClassLoader2) for the method's defining class, org/apache/http/impl/client/HttpClientBuilder, have different Class objects for the type org/apache/http/client/CredentialsProvider used in the signature at org.jfrog.build.client.PreemptiveHttpClient.createHttpClientBuilder(PreemptiveHttpClient.java:117) at org.jfrog.build.client.PreemptiveHttpClient.<init>(PreemptiveHttpClient.java:72) at org.jfrog.build.client.ArtifactoryHttpClient.getHttpClient(ArtifactoryHttpClient.java:125) at org.jfrog.build.client.ArtifactoryHttpClient.getHttpClient(ArtifactoryHttpClient.java:120) at org.jfrog.build.client.ArtifactoryHttpClient.getVersion(ArtifactoryHttpClient.java:133) at org.jfrog.build.extractor.clientConfiguration.client.ArtifactoryBuildInfoClient.verifyCompatibleArtifactoryVersion(ArtifactoryBuildInfoClient.java:294) at org.jfrog.hudson.ArtifactoryBuilder$DescriptorImpl.doTestConnection(ArtifactoryBuilder.java:174) at sun.reflect.GeneratedMethodAccessor1394.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:320) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:163) at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96) at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746) ... 49 more
 
Is there any thing am missing or is it bug in plugin ?