Recently we got a new svn repository and bugtrackers for Irrlicht due to an sourceforge update. So when you work with svn you should update the address as the old one will no longer get updates. Old repositories will be kept online as read-only. You can check-out with the new path like:
svn checkout svn://svn.code.sf.net/p/irrlicht/code/trunk irrlicht-trunk