error when run WRF using Bias-Corrected CMIP5 CESM datasets

Hi,
I used Bias-Corrected CMIP5 CESM datasets to simulate future scenarios, when the sst_update=1, the following errors appears:

FATAL CALLED FROM FILE: <stdin> LINE: 401
error opening ./met_RCP85/met_em.d02.2050-01-01_06:00:00.nc for input; bad date in namelist or file not in directory

The initial time is 2050-01-01_00:00:00, why the model ask for 2050-01-01_06:00:00 met_em* file for nested domain? But when the sst_update=0, the ./real can be successful.

Is there anyone could help me? I attached my namelist.input file. Thank you very much!

start (end)_ Date should be set to the simulation time period and then create the corresponding time met_em* file. I only set the simulation start time.

That is correct. You do need to have wrflowinp_d02 to update surface variables in D02.