Calculation reference error on zscore

Hie guys,

I’m getting the followin error:

calculation Error: Error in calculation for /data/Nutriton_Statistics/score
Logic references Height which is not a valid question or value. You may
have forgotten to include the full path to the question e.g /data/Height).
(Expanded reference: instance(zscores-2to5yrs)/zscore_list/zsore[1]/Height)

I followed the instructions on creating and calculating zscores and changed
the field called ‘month’ in the help site guide to ‘Height’, and uploaded
the appropriate values.

I’m thinking I may have missed somethin.

Can someone please help me so I go past this error and calculate the
zscores correctly