AuthenticationManager implementation null does not exist

Hi,

I am using Bonita version 7.1 subscription edition and i tried to login into one of our environments .
I got the following error once i enter my credentials. It's a bit strange that it happened suddenly.
Could anyone help?

org.bonitasoft.console.common.server.login.servlet.LoginServlet org.bonitasoft.console.common.server.login.servlet.LoginServlet doPost
SEVERE: Error while trying to log in
javax.servlet.ServletException: org.bonitasoft.console.common.server.auth.AuthenticationManagerNotFoundException: The AuthenticationManager implementation null does not exist!
at org.bonitasoft.console.common.server.login.LoginManager.getAuthenticationManager(LoginManager.java:83)
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:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
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:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.bonitasoft.console.security.SessionFixationValve.invoke(SessionFixationValve.java:77)
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:1074)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
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: 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)
... 32 more

Thanks,