hello i want to solve this pde equation numericaly with pdsolve:

diff(u(x, t), x, x) + diff(u(x, t), t, t)/0.5^2 - 2*diff(u(x, t), x, t)/0.5^2 = -0.0013*u(x, t) + 8.6510*u(x, t)^3

and enter this codes:

PDE := diff(u(x, t), x, x) + diff(u(x, t), t, t)/0.5^2 - 2*diff(u(x, t), x, t)/0.5^2 = -0.0013*u(x, t) + 8.6510*u(x, t)^3
IBC := {u(0, t) = 0.01, u(4, t) = 0, u(x, 0) = 0, D[1](u)(x, 0) = 0};
pds := pdsolve(PDE, IBC, numeric, t = time, rage = 0 .. 1);

but this error appear :

Error, (in pdsolve/numeric/process_IBCs) initial/boundary conditions can only contain derivatives which are normal to the boundary, got (D[1](u))(x, 0)

and i don't know how ti fix it.

can someone help me?