How to fix this symengine error?

I was following procedures for our experiment and symengine error occured.

G = (12*s^3 + 24*s^2 + 28*s + 9)/(2*(- 24*s^4 - 12*s^3 + 70*s^2 + 156*s + 99))

>> v_t = heaviside(t);

>> V_s = laplace(v_t);

>> Vc_s = G*V_s;

>> vc_t = ilaplace(Vc_s);

>> t = 0:.1:10;

>> vc_t = matlabFunction(vc_t);

Error using symengine

Code generation failed due to unexpected object of type

'RootOf'.

Error in sym/matlabFunction>mup2mat (line 404)

res = mupadmex('symobj::generateMATLAB',r.s,ano,spa,0);

Error in sym/matlabFunction>mup2matcell (line 374)

r = mup2mat(c{1},true,sparseMat);

Error in sym/matlabFunction (line 188)

body = mup2matcell(funs, opts.Sparse);

[Paul]

Is it required to find the symbolic solution and then evaulate it numerically? Or is it allowed to go straight to a numerical solution of vc_t?