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CAM5 branch run

Hi,

I am trying to do a CAM 5 branch run from standalone CAM 5 scripts and have configured the model to run in branch mode. I have also specified the required restart files in the various namelist files using namelist variables such as
'cam_branch_file' for cam_inparam, 'nrevsn' for clm and 'restart_file' for the coupler (driver). However, when I tried running the model it gave me the following error.
******************************************
(seq_mct_drv) : Initialize ocn component
(shr_file_setIO) file ocn_modelio.nml non existant
Application 17122689 exit codes: 139
Application 17122689 exit signals: Killed
Application 17122689 resources: utime 0, stime 0
Execution complete: Thu Aug 11 16:57:42 PDT 2011
********************************************
I understand that I also need to specify the restart file for the docn model which is a '.bin' restart file that I accidentally deleted. Could I still conduct a branch run without this file ?
My second question is in my build-namelist settings, I use
REF_DATE = 20070101 (for example) and ref_tod=0
However, start_ymd is set to 20040501 which is the start period of my run. I essentially ran the model for 2 years and now want to branch out and change the history file output frequency.
Is this setting required for a branch run ?

Any help on the above would be appreciated.

Thanks.
 
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