hi 
i am running Regcm 4.1. in 4gb ram of fedora linux pc
while i am running for one month of 2009 year. after 1 month  completed in 2 nd month the following error appears   



OPENING NEW OUT FILE: output/ATM.2009070100
> OPENING NEW BAT FILE: output/SRF.2009070100
> OPENING NEW RAD FILE: output/RAD.2009070100
>     at day =    0.0113, ktau =         50 :  1st, 2nd time deriv of ps =
> 0.14308E-03 0.96722E-06,  no. of points w/convection =    1998
>     at day =    0.0229, ktau =        100 :  1st, 2nd time deriv of ps =
> 0.13989E-03 0.10220E-05,  no. of points w/convection =    1814
>     at day =    0.0345, ktau =        150 :  1st, 2nd time deriv of ps =
> 0.14030E-03 0.11685E-05,  no. of points w/convection =    1595
>     at day =    0.0461, ktau =        200 :  1st, 2nd time deriv of ps =
> NaN         NaN        ,  no. of points w/convection =       0
>     at day =    0.0576, ktau =        250 :  1st, 2nd time deriv of ps =
> NaN         NaN        ,  no. of points w/convection =       0







above this error occur but my model still running  is ther any problem with data or model please help  me