I’ve already looked at several plausible options, but none seem to address my bug. Here are the three closest I found:

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When I create a stacked 100% horizontal barplot, the individual components show as uniform grey. I want to use scale_color_brewer(type = "qual", palette = "Paired"), but it doesn’t work. I continue getting the same output (no error messages).

This is the data file and my code (none of the four fill methods shown in this block worked for me):

Logan <- read.csv('Logan3.csv', fileEncoding = "UTF-8-BOM")

mancol <- c("#a6cee3", "#1f78b4", "#b2df8a", "#33a02c")

Logan %>% ggplot(
  aes(x=Locations, y = Percent, Fill = Tasks)
  ) +
    geom_bar(stat = 'identity', position = "stack") +
    coord_flip() +
    scale_fill_manual(values=mancol)
    #scale_fill_brewer(palette = "Set1")
    #scale_fill_manual(c("#a6cee3", "#1f78b4", "#b2df8a", "#33a02c"))
    #scale_color_brewer(type = "qual", palette = "Paired")

>Solution :

As @stefan said in the comments, it’s just a typo: use fill = Tasks, not Fill.

Changing that fixes the problem immediately.