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data land model run

Dear All,I am running CESM WACCM (CAM4%WCCM,DLND%LCPL,CICE,DOCN), but when I build the case, it comes out some errors:CAM writing dry deposition namelist to drv_flds_in
Writing ocean component namelist to ./docn_in
CAM writing namelist to atm_in
ERROR(build-namelist::new): Required input variable yearfirst was not found
ERROR: dlnd.buildnml.csh failed
ERROR from preview namelist - EXITINGDoes anyone know why? And how to solve the problem?I know that data land model requires input data, but I used to build similar data model case without requiring input data during building.Many thanks!
 
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