How to deal with the boundary conditions of 1D discontinuous finite element?

How to deal with the boundary conditions of 1D discontinuous finite element?

problem KDV(u1,v)=int1d(Thf)(u1v/dt)-int1d(Thf)(u0v/dt)
+int1d(Thf)(dx(u1)*dxx(v))
-intallBE(Thf)(jump(dxx(u1)v)
-intallBE(Thf)(jump(dx(u1)dx(v))
-int1d(Thf)(u0
u1
dx(v));
//error faild
-intallBE(Thf)(jump(dxx(u1)*v) error operator ( <10LinearCombISt4pairI7MGauche6MDroitE4C_F0E>
List of choices
( <10LinearCombI6MDroit4C_F0E> : <10LinearCombI6MDroit4C_F0E> )
( : )
( : )
( <10LinearCombI7MGauche4C_F0E> : <10LinearCombI7MGauche4C_F0E> )