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Question: why Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

Question:why Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

Ex 95 Maple
June 14 2011
0

ex1 := {
diff(x1(s),s$2) - 2/x2(s)*diff(x1(s),s)*diff(x2(s),s) = 0,
diff(x2(s),s$2) + 1/x2(s)*diff(x1(s),s)^2-1/x2(s)*diff(x2(s),s) = 0
};
sol := dsolve(ex1);
ic := {x1(0)=0.1, x2(0)=0.1};
dsol := dsolve(ex1 union ic, numeric, range=0..1);
odeplot(dsol);

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

initial condition has already set 0.1 but still ask for must be numeric why?
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