[opencms-dev] Error while using comment module

[Neeraj Kumar]

Hi All,
        I am new in opencms I tried to use comment module inside our 
application but I am not able to do that.I am getting some problem which 
mention below:-

java.lang.NullPointerException
	at com.alkacon.opencms.comments.CmsCommentsAccess.getCommentFilter
(CmsCommentsAccess.java:911)
	at 
com.alkacon.opencms.comments.CmsCommentsAccess.getCountStateComments
(CmsCommentsAccess.java:532)
	at com.alkacon.opencms.comments.CmsCommentsAccess.getPages
(CmsCommentsAccess.java:573)
	at com.alkacon.opencms.comments.CmsCommentsAccess.init
(CmsCommentsAccess.java:684)
	at org.opencms.jsp.CmsJspLoginBean.<init>(CmsJspLoginBean.java:95)
	at com.alkacon.opencms.comments.CmsCommentsAccess.<init>
(CmsCommentsAccess.java:184)
	at 
org.apache.jsp.WEB_002dINF.jsp.offline.system.modules.com_alkacon_opencms_
comments.elements.comment_005fform_jsp._jspService
(comment_005fform_jsp.java:58)
	at org.apache.jasper.runtime.HttpJspBase.service
(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service
(JspServletWrapper.java:374)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile
(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service
(JspServlet.java:267)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke
(ApplicationDispatcher.java:630)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude
(ApplicationDispatcher.java:535)
	at org.apache.catalina.core.ApplicationDispatcher.include
(ApplicationDispatcher.java:472)
	at org.opencms.flex.CmsFlexRequestDispatcher.includeExternal
(CmsFlexRequestDispatcher.java:194)
	at org.opencms.flex.CmsFlexRequestDispatcher.include
(CmsFlexRequestDispatcher.java:169)
	at org.opencms.loader.CmsJspLoader.service(CmsJspLoader.java:1193)
	at 
org.opencms.flex.CmsFlexRequestDispatcher.includeInternalWithCache
(CmsFlexRequestDispatcher.java:423)
	at org.opencms.flex.CmsFlexRequestDispatcher.include
(CmsFlexRequestDispatcher.java:173)
	at org.opencms.loader.CmsJspLoader.dispatchJsp
(CmsJspLoader.java:1227)
	at org.opencms.loader.CmsJspLoader.load(CmsJspLoader.java:1171)
	at org.opencms.loader.A_CmsXmlDocumentLoader.load
(A_CmsXmlDocumentLoader.java:232)
	at org.opencms.loader.CmsXmlContentLoader.load
(CmsXmlContentLoader.java:52)
	at org.opencms.loader.CmsResourceManager.loadResource
(CmsResourceManager.java:964)
	at org.opencms.main.OpenCmsCore.showResource
(OpenCmsCore.java:1498)
	at org.opencms.main.OpenCmsServlet.doGet(OpenCmsServlet.java:152)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:845)
	at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process
(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run
(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)


can anybody tell me why i am getting this error and how i solve it.

Thanks and regards
Neeraj