AuthenticationManager implementation null does not exist

Hi,

I'm using Bonita 7.2.2 and I am started getting below error :

org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/bonita].[loginService] org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [loginService] in context with path [/bonita] threw exception [javax.servlet.ServletException: org.bonitasoft.console.common.server.auth.AuthenticationManagerNotFoundException: The AuthenticationManager implementation null does not exist!] with root cause
org.bonitasoft.console.common.server.auth.AuthenticationManagerNotFoundException: The AuthenticationManager implementation null does not exist!
at org.bonitasoft.console.common.server.auth.AuthenticationManagerFactory.getAuthenticationManager(AuthenticationManagerFactory.java:40)
at org.bonitasoft.console.common.server.login.LoginManager.getAuthenticationManager(LoginManager.java:77)
at org.bonitasoft.console.common.server.login.LoginManager.login(LoginManager.java:59)
at org.bonitasoft.console.common.server.login.servlet.LoginServlet.doLogin(LoginServlet.java:187)
at org.bonitasoft.console.common.server.login.servlet.LoginServlet.doPost(LoginServlet.java:100)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
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 org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
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:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.bonitasoft.console.security.SessionFixationValve.invoke(SessionFixationValve.java:77)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

Please help.

Thanks,