title: Error in devstack script. nova-api did not start?
body: <p>I have installed openstack on Ubuntu 12.04 single node using devstack. Now, it was running smoothly till yesterday. When i ran ./stack.sh today, it showed an error</p>
  
  <p>./stack.sh:672 nova-api did not start</p>
  
  <p>I have python-paste and python-pastedeploy installed. How to fix this error?</p>