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Question: Error, `sol2` does not evaluate to a module

Question:Error, `sol2` does not evaluate to a module

Amare 5 Maple
August 28 2012
0 
After numerically solving an ODE, I want to save the solutions as a .dat file. I got this from the internet net for PDES and tried by adapt it to odes using dsolve. But I get this: Error, `sol` does not evaluate to a module 
PDE := diff(u(x, t), t, t)-(diff(u(x, t), x, x))+.2(diff(u(x, t), t))-1/2*(u(x, t)-u(x, t)^3) = 0;
 IBC := {u(-15, t) = -1, u(15, t) = 1, u(x, 0) = tanh(x), (D[2](u))(x, 0) = -1/cosh(x)^2}; sol := pdsolve(PDE, IBC, 'numeric', u(x, t)); ut := sol:-value(u(x, t), output = listprocedure); file := "/Users/Default/datafile.dat"; for tt from .2 by .2 to 10 do for xx from -15 by .5 to 15 do
 fprintf(file, "%f %f %lf\n", tt, xx, (rhs(ut[3]))(xx, tt)) end do end do; 
fclose(file)
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