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Pig >> mail # user >> error

mf0 = LOAD 'max.txt’ AS (maxi:double);

data =  LOAD
USING PigStorage(',')

                                                AS (id:long, f0:double)

gruped =  group data all;

nf0 = foreach gruped generate features.id,features.f0/mf0;

But I am getting an error in last line?

Invalid scalar projection: mf0 : A column needs to be projected from a
relation for it to be used as a scalar

What am I missing