Question: got an error, while running the code

i got error while running the code. 



restart; de := diff(f(y), y, y, y, y)+2*W*(diff(f(y), y, y, y))^2+3*(diff(f(y), y, y, y, y))*(diff(f(y), y, y))-(M*M)*(diff(f(y), y, y))+G*(diff(theta(y), y, y))+B*(diff(phi(y), y, y)) = 0, diff(theta(y), y, y)+Nb*(diff(theta(y), y))*(diff(phi(y), y))+Nt*(diff(theta(y), y))^2 = 0, diff(phi(y), y, y)+Nb*(diff(theta(y), y, y))/Nt = 0, f(h1) = (1/2)*F, f(h2) = -(1/2)*F, (D(f))(h1) = -1, theta(h2) = 1, phi(h2) = 1, (D(f))(h2) = -1, theta(h1) = 0, phi(h1) = 0; d1 := subs(h1 = 1.1, h2 = -1.5, Nb = 7, Nt = 1, G = 2, B = 2, W = .2, M = 2, F = 1, [de]); d2 := subs(h1 = 1.1, h2 = -1.5, Nb = 7, Nt = 3, G = 2, B = 2, W = .2, M = 2, F = 1, [de]); d3 := subs(h1 = 1.1, h2 = -1.5, Nb = 7, Nt = 5, G = 2, B = 2, W = .2, M = 2, F = 1, [de]);de1 := dsolve(d1, numeric); de2 := dsolve(d2, numeric); de3 := dsolve(d3, numeric);

Error, (in dsolve/numeric/bvp) unable to achieve requested accuracy of 0.1e-5 with maximum 128 point mesh (was able to get .21), consider increasing `maxmesh` or using larger `abserr`
Error, (in dsolve/numeric/bvp) unable to achieve requested accuracy of 0.1e-5 with maximum 128 point mesh (was able to get .25), consider increasing `maxmesh` or using larger `abserr`
Error, (in dsolve/numeric/bvp) unable to achieve requested accuracy of 0.1e-5 with maximum 128 point mesh (was able to get .22), consider increasing `maxmesh` or using larger `abserr`



thanks.