error month_to_seasonN

I changed the resolution of the original data to 2 degrees (using linint2)=
, and now need to plot the DJF seasonal average for the data, but retur=
ns this error, and I do not understand why the time has dimensions of jus=
t 12. How do I solve this?
Variable: tType: floatTotal Size: 68812800 bytes 17203200 values=
Number of Dimensions: 4Dimensions and sizes: [ncl_join | 25] x [time | 12] =
x [LAT | 224] x [LON | 256]Coordinates: LAT: [-89.59821..89.598=
21] LON: [-180..178.5938]Number Of Attributes: 3 _FillValue : 9=
.96921e+36 units : degC long_name : SST
(0) contributed.ncl: month_to_seasonN: dimension must be a multiple of 12

fils = systemfunc("ls *.nc")
f = addfiles(fils, "r")
ListSetType(f,"join") t =f[:]->bsst(:,:,:,:)
printVarSummary(t)
;media= dim_avg_n_Wrap(t, 0)
x=month_to_seasonN(t,"DJF")
.....
plot = gsn_csm_contour_map_polar(wks,x,res)
---Vanúcia SchumacherMestranda em Meteorologia - UFVMeteorologista -UFPel
Departamento de Meteorologia Agrícola - DEACel: (31) 9978 2522 DEA: (31) =
3899 1890 =

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Received on Wed Jul 16 06:13:54 2014