closes tidyverse#3060

Author: clairemcwhite

NEWS.md

@@ -8,6 +8,8 @@
 
 * `coord_map()` now can have axes on the top and right (@karawoo, #3042).
 
+* Clearer error messages for innappropriate aesthetics. (@clairemcwhite, #3060).
+
 * `geom_rug()` gains an "outside" option to allow for moving the rug tassels to outside the plot area. (@njtierney, #3085)
 
 * `geom_rug()` now works with `coord_flip()` (@has2k1, #2987).