Error 404 Starting travel Request Application Hyperlink

I am trying to understand why this is so. 

I worked with the video on Youtube , all works fine until i put the link to the browser. Just threw this Exception back and says 

Session is Null 

Log gave this Exception

2019-03-13 13:27:29.975 +0100 SEVERE: org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/bonita].[livingApplicationPageServlet] Servlet.service() for servlet [livingApplicationPageServlet] in context with path [/bonita] threw exception [Session is null!] with root cause
javax.servlet.ServletException: Session is null!
    at org.bonitasoft.livingapps.LivingApplicationPageServlet.handleException(LivingApplicationPageServlet.java:206)
    at org.bonitasoft.livingapps.LivingApplicationPageServlet.getCustomPageName(LivingApplicationPageServlet.java:173)
    at org.bonitasoft.livingapps.LivingApplicationPageServlet.doGet(LivingApplicationPageServlet.java:107)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    at org.bonitasoft.livingapps.LivingApplicationPageServlet.service(LivingApplicationPageServlet.java:80)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    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:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.bonitasoft.console.common.server.filter.CacheFilter.proceedWithFiltering(CacheFilter.java:74)
    at org.bonitasoft.console.common.server.filter.ExcludingPatternFilter.doFilter(ExcludingPatternFilter.java:37)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.bonitasoft.console.common.server.filter.ExcludingPatternFilter.excludePatternFiltering(ExcludingPatternFilter.java:42)
    at org.bonitasoft.console.common.server.filter.ExcludingPatternFilter.doFilter(ExcludingPatternFilter.java:35)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.bonitasoft.console.common.server.login.filter.AbstractAuthorizationFilter.doFilter(AbstractAuthorizationFilter.java:61)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    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)
 

Hi,

I think your question is linked to the previous one you opened. To make it easier for someone to help you, I just copied/pasted your question as a comment of your previous one.

In addition to that, could you please add in a comment of your previous question a few more details : 

- the version you use
- coud you please write the URL you entered in your comment because it is cut on the image your attached.

Thank you

Delphine