odeToVectorField ERROR PLEASE HELP

syms x(t) f(t) x3(t) g(t) t

eqn1 = v == diff(x, t);

eqn2 = diff(v) == -3647.333890*x-99.48571587*v+3947.845868*x3+3947.845868*g+0.0002385211688*f;

eqn3 = diff(x3) == -0.004499581734*eqn2-0.71466948*v-28.3599*x+28.3599*g;

eqns = [eqn1 eqn2 eqn3];

V = odeToVectorField(eqns)

I want to solve this but it shows me error

i have 3 odes f and g are inputs x,v are outputs and x3 is state variable ?

[Daniel Pollard]

https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer