ggplot facet_wrap: At least one layer must contain all variables used for facetting

I am using the command

qplot(factor(ww), WeeklyYield, geom = "bar", fill = I("grey50"))+facet_wrap(~model+name)

to create a bar chart for every combination of model and name. However I get the following error message:

Error in layout_base(data, vars, drop = drop) : At least one layer must contain all variables used for facetting

I cannot uncode this message.

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