# geom_ribbon() checks the aesthetics
Problem while setting up geom.
i Error occurred in the 1st layer.
Caused by error in `setup_data()`:
! Either xmin or xmax must be given as an aesthetic.
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Problem while setting up geom.
i Error occurred in the 1st layer.
Caused by error in `setup_data()`:
! Either ymin or ymax must be given as an aesthetic.
---
Problem while converting geom to grob.
i Error occurred in the 1st layer.
Caused by error in `draw_group()`:
! Aesthetics can not vary along a ribbon
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`outline.type` must be one of "both", "upper", "lower", or "full", not "test".
Generated by dwww version 1.15 on Wed May 22 21:35:29 CEST 2024.