Question: system of ODE's

below is the system of ODE's im trying to solve, however i get this error which i cannot get round, can anyone help?

 

> eqn10 := (diff(e(z)^2, z))*h[0]^2 = ((3/2)*e(z)^2*h[0]^2-(n/f(z))^2/(2*m^2*(3*m^2*h[0]^2*(e(z)^2-O*(1+z)^(3*g))))+(1/2)*((g-1)*3)*h[0]^2*O*(1+z)^(3*g))/(2*(1+z));
> eqn11 := diff(f(z), z) = -e(z)*h[0]*(1+z)*sqrt(1-(n/f(z))^2/(3*m^2*h[0]^2*(e(z)^2-O*(1+z)^(3*g))));
>
> eqn12 := subs(h[0] = 74.2, m = 0.2176e-7, O = .27, g = 1.2, n = 0.20e-3, eqn10);
> eqn13 := subs(h[0] = 74.2, m = 0.2176e-7, O = .27, g = 1.2, n = 0.20e-3, eqn11);
>
> sol4 := dsolve([eqn12, eqn13, f(0) = 1, e(0) = 1], numeric);
Error, (in f) unable to store '-6210.3782453230*I' when datatype=float[8]
 

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