Problem with Workflow after upgrade

[jack_chuong]

Hi all,
I have upgraded Alfresco from 4.2.c to 5.0.a following this guide http://docs.alfresco.com/4.0/tasks/upgrade-process.html
After upgrade, when selecting 'Start Workflow' in the Alfresco Share interface, the wizard interface starts, however, the "please select a workflow" tables can't drop down for me to be able to select a workflow definition to start a workflow…
I read this topic : https://forums.alfresco.com/forum/end-user-discussions/alfresco-share/solved-workflows-not-available...
But I don't know anything about Tomcat, Java stuffs … How can I "use the workflow admin console* to remove those workflow definitions causing problems, or just add the module back in" ?

Please let me know if you need more information.
Thanks in advanced.

[jack_chuong]

Can anyone help me ? Workflow still not working
I notice that after upgrade, there is no directory "workflow" in /opt/alfresco-5.0.a/tomcat/webapps/alfresco/WEB-INF/classes/alfresco

[balai_kidz]

We're in the same page bro, I also got similar issues with you, are you running alfresco based on installer or from source code? If from installer, you need to reinstall Web Quick Start modules before start up the migration. In alfresco CE 5.0.a, I think they still did not provide war files for Web Quick Start.