library(ggplot2)

# see https://r-graph-gallery.com/4-barplot-with-error-bar.html

png(file = "barplot.png")

# create dummy data
data <- data.frame(
  name=c('','yy','zz','ff','DR12'),
  flux=c(1,2,3,4,5),
  err=c(1,0.2,3,2,4)
)
 
# Most basic error bar
ggplot(data) +
    geom_bar(aes(x=name, y=flux), stat="identity", fill="skyblue", alpha=0.7) +
    geom_errorbar( aes(x=name, ymin=flux-err, ymax=flux+err), width=0.4, colour="black", alpha=0.9, linewidth=2)
    

dev.off()