RoboHelp Server 9 Web Administrator Login not working

We have successfully installed Robo Help Server 9 and Apache Tomcat 7.0. We are successfully created the context in Robo Help Configuration Manager.

My laptop configuration: Win 7 64bit

During Web Administrator Login, we have faced the following error:

2014-10-17 17:20:22.997 [WARN] http-bio-8080-exec-4 adobe.robohelp.server.DatabaseManager -

java.lang.NullPointerException

  at adobe.robohelp.server.DatabaseManager.isConnected(DatabaseManager.java:461)

  at adobe.robohelp.server.AuthAgent.AuthenticateUser(AuthAgent.java:168)

  at adobe.robohelp.server.AuthAgent.Authenticate(AuthAgent.java:68)

  at adobe.robohelp.server.RoboHelpServer.doGet(RoboHelpServer.java:178)

  at adobe.robohelp.server.RoboHelpServer.doPost(RoboHelpServer.java:244)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j ava:303)

  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:503)

  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

  at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)

  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:107 0)

  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.jav a:611)

  at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)

  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)

  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

  at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

  at java.lang.Thread.run(Unknown Source)

2014-10-17 17:20:22.998 [WARN] http-bio-8080-exec-4 adobe.robohelp.server.AuthAgent -

java.lang.NullPointerException

  at adobe.robohelp.server.DatabaseManager.isConnected(DatabaseManager.java:472)

  at adobe.robohelp.server.AuthAgent.AuthenticateUser(AuthAgent.java:168)

  at adobe.robohelp.server.AuthAgent.Authenticate(AuthAgent.java:68)

  at adobe.robohelp.server.RoboHelpServer.doGet(RoboHelpServer.java:178)

  at adobe.robohelp.server.RoboHelpServer.doPost(RoboHelpServer.java:244)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j ava:303)

  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:503)

  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

  at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)

  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:107 0)

  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.jav a:611)

  at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)

  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)

  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

  at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

  at java.lang.Thread.run(Unknown Source)

Please help us urgently.