ggplot2 Error: Aesthetics must either be length one, or the same length as the dataProblems:colors, letters

Question

I\'m getting this error:

Error: Aesthetics must either be length one, or the same length as the dataProblems:colors, letters

when I

Answer 1

(Adding a full answer for clarity's sake; consolidating on comments from Pascal, johnson_shuffle, & Jaap)

Plotting code should look like:

ggplot(Z, aes(x=Track, y=Position, fill=Name, label=Name)) +
  geom_raster() +
  geom_text()