Question: Warning, unable to store ... when datatype=integer. What does this warning mean?

    Hello, colleagues!

    I want to find zero function given by the process that integrates the ODE, but get this warning and do not know what to do with it.  I will be grateful to any advice!!!

T0 := 300; G1 := 1.2*10^6; G2 := 1.2*10^6; k := 1.79333595*10^(-6); l := 1/(12*10^4); U_max := 5.0; th0 := .5; q0 := 0.1e-2:

u(x):=piecewise(x<=-1,-U_max,x>1,U_max,x<=1 and x>-1,0): 

sys := diff(x1(t), t) = x2(t),
           diff(x2(t), t) = l*u(x4(t))-k*sin(2*x1(t)),

           diff(x4(t), t) = -x3(t),

            diff(x3(t), t) = 2*k*cos(2*x1(t))*x4(t);


init:=x1(0)=th0,   x2(0)=q0: 

h1 := proc (t1, alpha_1, alpha_2, th_0, q_0, g1)::float;
local X1, X3, Res;
ptions operator, arrow;
global sys, u;
X1 := eval(x1(t), dsolve({sys, x1(0) = th_0, x2(0) = q_0, x3(0) = alpha_1, x4(0) = alpha_2}, numeric, range = 0 .. t1, output = listprocedure));
X3 := eval(x3(t), dsolve({sys, x1(0) = th_0, x2(0) = q_0, x3(0) = alpha_1, x4(0) = alpha_2}, numeric, range = 0 .. t1, output = listprocedure));
es := X3(t1)+2*g1*X1(t1);
return Res end proc

h2 := proc (t1, alpha_1, alpha_2, th_0, q_0, g2)::float;
local X2, X4, Res;
options operator, arrow;
global sys, u;
X2 := eval(x2(t), dsolve({sys, x1(0) = th_0, x2(0) = q_0, x3(0) = alpha_1, x4(0) = alpha_2}, numeric, range = 0 .. t1, output = listprocedure));
X4 := eval(x4(t), dsolve({sys, x1(0) = th_0, x2(0) = q_0, x3(0) = alpha_1, x4(0) = alpha_2}, numeric, range = 0 .. t1, output = listprocedure));
Res := X4(t1)+2*g2*X2(t1);
return Res
end proc

Test_h1 := proc (x, y)::float;
h1(10.0, x, y, 0.209327944398961e-2, -0.417641536045032e-3, G2)
end proc;

Test_h2 := proc (x, y)::float;
h2(10.0, x, y, 0.209327944398961e-2, -0.417641536045032e-3, G2)
end proc

fsolve([Test_h1, Test_h2]);
Warning, unable to store _EnvDSNumericSaveDigits when datatype=integer[8]
Test_2.mw