CDO

Hi i have been trying to use sellonlatbox operation on my ukcp18 5km rcm data, but it hasn't been executed, can someone help me with that please? i even tried ncpdq to rearrange but still of no use.
cdo sellonlatbox,-4,-3,54,53 pr_rcp85_land-cpm_uk_5km_01_mon_198012-198111.nc output.nc
Warning (cdfScanVarAttr): Time must be the first dimension! Unsupported array structure, skipped variable pr!
Warning (cdf_set_var): Inconsistent variable definition for pr!
Warning (cdf_check_variables): Unsupported data type (char/string), skipped variable yyyymm!
Warning (cdfInqContents): Coordinates variable ensemble_member_id can't be assigned!
Warning (cdfInqContents): Coordinates variable month_number can't be assigned!
Warning (cdfInqContents): Coordinates variable year can't be assigned!