# aesthetic checking in geom throws correct errors
Problem while setting up geom aesthetics.
i Error occurred in the 1st layer.
Caused by error in `use_defaults()`:
! Aesthetic modifiers returned invalid values
x The following mappings are invalid
x `colour = after_scale(data)`
i Did you map the modifier in the wrong layer?
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Aesthetics must be either length 1 or the same as the data (4)
x Fix the following mappings: `d` and `e`
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