When i am trying to open system-Rest API Browser it gives errors?

[Pornima Bhoyar]

java.lang.NoClassDefFoundError: com/atlassian/jira/plugin/rpc/SoapModuleDescriptor at com.atlassian.labs.restbrowser.provider.JiraSoapServiceProvider.getSoapServices(JiraSoapServiceProvider.java:25) [?:?] at com.atlassian.labs.restbrowser.servlet.RestBrowserServlet.getJsonRpcDescriptors(RestBrowserServlet.java:65) [?:?] at com.atlassian.labs.restbrowser.servlet.RestBrowserServlet.getContext(RestBrowserServlet.java:50) [?:?] at com.atlassian.labs.restbrowser.servlet.RequiresLoginServlet.doGet(RequiresLoginServlet.java:47) [?:?] at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) [servlet-api.jar:?] at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) [servlet-api.jar:?] at com.atlassian.plugin.servlet.DelegatingPluginServlet.service(DelegatingPluginServlet.java:37) [atlassian-plugins-servlet-4.5.0.jar:?] at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) [servlet-api.jar:?] at com.atlassian.plugin.servlet.ServletModuleContainerServlet.service(ServletModuleContainerServlet.java:45) [atlassian-plugins-servlet-4.5.0.jar:?] at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) [servlet-api.jar:?] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) [catalina.jar:7.0.52] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.52] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat7-websocket.jar:7.0.52] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.52] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.52] at com.atlassian.jira.web.filters.JiraLastFilter.lambda$doFilter$0(JiraLastFilter.java:39) [JiraLastFilter.class:?] at com.atlassian.jira.web.filters.JiraLastFilter$$Lambda$1079/1928604384.doFilter(Unknown Source) [?:?] at com.atlassian.jira.web.filters.steps.ChainedFilterStepRunner.doFilter(ChainedFilterStepRunne

[Alexey Matveev]

Kindly make sure that the Rest Api Browser installed and enabled

[Pornima Bhoyar]

Yes I checked it. Rest Api Browser is installed and enabled but still the same error is shown on screen whenever I click on REST API Browser link.