Chebfun failing to apply boundary conditions to operator in Matlab 2018a

[Delineav]

I am trying to solve a two-phase flow problem characterized by the Orr-Sommerfeld equations (Au=iwBu), but when trying to apply the BCs to the second operator (B) I get the following error:

Warning: Constraints on B are ignored.

also, I wonder if the chebop can take into account the fact that some of my BCs are of the form: au(0)=iwbu(0) and cannot be writen as au(0)-iwbu(0) = 0 for the fact that w (the eigenvalues I want to compute) is a part of the BCs.
Problem and m file attached.

Thanks
github.zip