急急急 求大神帮忙解决下

proc sgplot data=data;
vbar CO2 / response=freq barwidth=0.4 discreteoffset=-0.2 fillattrs=(color=red);
vbar CH4 / response=freq barwidth=0.4 discreteoffset=0.2 fillattrs=(color=blue);
/*sumvar=  group=  subgroup=*/
xaxis label="国家代码";
yaxis label="排放量";
title "不同国家二氧化碳和甲烷的排放量";
keylegend / location=inside position=topleft;
run;

proc sgplot data=data;
vbar code / response=CO2 barwidth=0.4 discreteoffset=-0.2 fillattrs=(color=red);
vbar code / response=CH4 barwidth=0.4 discreteoffset=0.2 fillattrs=(color=blue);
/*sumvar=  group=  subgroup=*/
xaxis label="国家代码";
yaxis label="排放量";
title "不同国家二氧化碳和甲烷的排放量";
keylegend / location=inside position=topleft;
run;