I wrote the following code and got an error "invalid varlist":

scatter capstateratio6 year, by(prov) yaxis(1) || scatter cappriratio6 year, by(prov) yaxis(1) ///
|| scatter capforratio6 year, by(prov) yaxis(1) || scatter expphypc year, by(prov) yaxis(2) ///
|| scatter explaw4pc year, by(prov) yaxis(2) || scatter expssepc year, by(prov) yaxis(2), ///
xlabel(1999(2)2006, angle(45)) ///
ytitle(1)("S/N/F capital ratio (%)") ytitle(2)("fiscal spending on P/I/L public goods (%)")
legend(order(1 "S(%)" 2 "N (%)" 3 "F (%)" 4 "P" 5 "I") 6 "L"))

Many thanks!
Linghui