Error : Ax4.0 Upgrade to Ax2012

hi … i am trying to upgrade Ax 4.0 to ax 2012.I have done Prepare Application data for preprocessing.After this I have run all job successfully for Run Live Preprocessing script having status finished.However next step is still disabled and thats why I am unable to enter single user mode. Kindly help me. I am stuck sine 3 days. could u plz guide me?