Error starting xen-3.4.4-rc1-pre.gz and Ubuntu 10.04

[2011-05-26 23:41:17 2424] INFO (SrvDaemon:332) Xend Daemon started
[2011-05-26 23:41:17 2424] INFO (SrvDaemon:336) Xend changeset: Mon May 09 03:06:33 2011 -0400 19987:3b39c0fd26a6.
[2011-05-26 23:41:18 2424] ERROR (SrvDaemon:349) Exception starting xend ((111, 'Connection refused'))
Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/SrvDaemon.py", line 341, in run
    servers = SrvServer.create()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/SrvServer.py", line 251, in create
    root.putChild('xend', SrvRoot())
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/SrvRoot.py", line 40, in __init__
    self.get(name)
  File "/usr/local/lib/python2.6/dist-packages/xen/web/SrvDir.py", line 84, in get
    val = val.getobj()
  File "/usr/local/lib/python2.6/dist-packages/xen/web/SrvDir.py", line 52, in getobj
    self.obj = klassobj()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/SrvNode.py", line 30, in __init__
    self.xn = XendNode.instance()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 949, in instance
    inst.save()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 484, in save
    self.save_networks()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 499, in save_networks
    for network_uuid in XendNetwork.get_all()])
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendBase.py", line 102, in get_record
    for key in keys])
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendNetwork.py", line 196, in get_VIFs
    vms = XendDomain.instance().get_all_vms()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendDomain.py", line 1778, in instance
    inst.init()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendDomain.py", line 113, in init
    xstransact.Mkdir(XS_VMROOT)
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/xenstore/xstransact.py", line 355, in Mkdir
    complete(path, lambda t: t.mkdir(*args))
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/xenstore/xstransact.py", line 361, in complete
    t = xstransact(path)
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/xenstore/xstransact.py", line 29, in __init__
    self.transaction = xshandle().transaction_start()
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/xenstore/xsutil.py", line 18, in xshandle
    xs_handle = xen.lowlevel.xs.xs()
Error: (111, 'Connection refused')