S5P_L2_CH4, ERROR: cannot keep non-existent variable CH4_column_number_density_avk

Trying to convert some S5P_L2_CH4 data to L3 and I am getting this error:

ERROR: cannot keep non-existent variable CH4_column_number_density_avk

when I run this command:

harpconvert --format hdf5 --hdf5-compression 5 -o ch4=bias_corrected -a ‘CH4_column_volume_mixing_ratio_dry_air_validity>50; derive(datetime_stop {time}); bin_spatial(3601, -90, 0.05, 7201, -180, 0.05);squash(time, (latitude_bounds,longitude_bounds));derive(latitude {latitude});derive(longitude {longitude}); keep(datetime_start, latitude, longitude, dry_air_column_number_density, CH4_column_volume_mixing_ratio_dry_air, CH4_column_number_density_avk)’

Any ideas on what I am getting wrong?

nevermind…

According to this post,

cant regrid averaging kernel variables