Error message popped up

I'm not sure what that error message means without being able to recreate it through a reprex but if you copied that code exactly, you need `` around Water Type, so it should be:

ggplot(Data,
aes(x = `Water type`, y = Aeromonas)) +
geom_boxplot(fill='lightblue', color='blue') +
geom_point(color='darkblue')

If that doesn't work, look here to make a reprex:

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