Here is my code:

with(DEtools): with(plots): with(linearAlgebra):

DE1 := diff(y(x), x) = d^3*y(x)/dx^3+3*d^2*y(x)/dx^2+4*d*y(x)/dx+12*y(x);

DEplot(DE1, [y(x), x = 0 .. 5][[y(0) = -3, (D(y))(0) = 0, ((D^(2)(y))(0) = 0, ((D^(3)(y))(0)]]);

I get the Error message: Error, (in DEtools/DEplot) called with too few arguments

Any help would be greatly appreciated, thanks.