part of my codes are:

func[1] := (1/2)*(c+s)*x[1]+s*x[3]+(s-c)*x[1]*x[2];
func[2] := (1/2)*(c-s)*x[1]+s*x[3]+(s+c)*x[1]*x[2];
func[3] := -b*x[2]-x[1]^2; 

They are just three ODE , how to fix the error?Where is the so-called recursive assignment...?

The program works well when:

"func[1] := x[2] + (x[1]^2 - x[1]*x[3]);

func[2] := - x[1] +  (x[2]^2 + x[1]*x[4]) + x[2]^3;