Hi,
Apologies for the delay in response. Are you still getting this error? If so,
1) Did you make any modifications to the WRF code files?
2) As a test, can you try setting time_step = 60 to see if that makes any difference? If that time step is too large (i.e., you get CFL errors when the model crashes), try setting it to 45.
3) If it's still failing, will you try running this again, but using a very simple (nearly-default) namelist.input file? In this file, modify the dates/times, domain settings, and using the RUC LSM physics option - but leave everything else as default - see if you get the same error, or if that makes any difference.