Noise Cancelling Simulink model with error message

Attached to this there is my trial to make a FXLMS based feedforward noise controller for an acoustic duct. What I have done so far is I have modeled the transfer function on the s domain, discretized the function to the z domain and then I have put the numerator coefficients of that z transform as coefficients to a FIR filter simulating the primary and secondary path (FIR filters have 1 as denominator). Simulink keep showing me this error message below. Can someone please help me understand what is wrong with my model? I already tried to change the setting for the model as they suggest, but with no success.

I based my model on the block diagram from this article http://www2.coe.pku.edu.cn/tpic/2010913102917710.pdf page 4, fig 5.

An error occurred while running the simulation and the simulation was terminated

Caused by:

Simulink cannot solve the algebraic loop containing 'SIMULINK_def/LMS' at time 4.5351473922902495E-5 using the TrustRegion-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues.

To rule out solver convergence as the cause of this error, either

a) switch to LineSearch-based algorithm using

set_param('SIMULINK_def','AlgebraicLoopSolver','LineSearch')

b) reducing the fixed step size.

If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification.