Hellow maple users, I am getting an error while solving system of differential equations analytically. Please help to recify the error. Thanks in advance. Here is my codes;

restart:

with(DETools):

# S, N are constant

Eq1:=diff(u(y),y,y)-u(y)=C(y):

Eq2:=diff(T(y),y,y)=u(y)-diff(u(y),y)^2-u(y)^2+S*T(y)+N*T(y):

Eq3:=diff(C(y),y,y)-C(y)=0:

desys:={Eq1,Eq2,Eq3};ics:={u(0)=0,D(u)(0)=h,T(1)=h,D(T)(0)=0,C(1)=h,D(C)(0)=0}:

combine(dsolve(desys union ics,{u(y),T(y),C(y)}));