[Building Sakai] Exception when "Add Attachments" button is pressed

[Nikolay Chillev]

I did checkout from
https://source.sakaiproject.org/svn/sakai/tags/sakai-2.6.0 and built
and deployed Sakai into Tomcat. But when I try to add an attachment in
Announcement or Assignment tool I get the following exception:

org.sakaiproject.portal.api.PortalHandlerException:
java.lang.NullPointerException
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:768)
caused by: java.lang.NullPointerException
    at org.sakaiproject.cheftool.ToolServlet.sendToHelper(ToolServlet.java:652)
    at org.sakaiproject.cheftool.ToolServlet.doGet(ToolServlet.java:212)
    at org.sakaiproject.cheftool.VelocityPortletPaneledAction.doGet(VelocityPortletPaneledAction.java:1014)

Any ideas how to fix?