help with build-namelist

I am trying to change the CO2 and the orbital years in the entire model. I know that I do this in 2 different locations. The CO2 variable that I am changing is to 1.8e-4. to do this I understand that I need to create a namelist in the atm/cam/bld directory, but when I try to use build-namelist -i or any other option I get an error saying that:

ERROR:: Configuration cache file: config_cache.xml does not exist! at /homebv/messig/ccsm3_0_1_beta14/models/atm/cam/bld/CAM_config.pm line 88. :confused:

I do not understand what I am doing wrong. Can someone please help me.
 
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