Why does this error appear to me? Thanks for your help!!
I want to visualize with a bar chart the sum of the GDP of the countries of the region by decade, i run this code:
gap_decade%>%
group_by(decade, region)%>%
summarise(gdp=sum(gdp))%>%
ggplot(aes(x=decade, y=gdp, fill=region)+
geom_col(position = "fill")
