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Question: directional fields

Question:directional fields

gon99 0 Maple 15
June 20 2012
0 
> restart; with(DEtools);
> ED1 := diff(y(x), x) = sen(y)+cos(x);
print(`output redirected...`); # input placeholder
                    d                        
                   --- y(x) = sen(y) + cos(x)
                    dx                       
> dfieldplot(ED1, y(x), x = 0, y = 0, title = `Ejemplo 1`, color = sen(y)+cos(x), arrows = almit, title = figura*(diff(1, x)));
%;
Error, (in DEtools/dfieldplot) invalid range for independent variable

help me how can i solve de error pleas
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