Partitioning parameters for each subsystem

I have a subsystem with mask parameters. I am partitioning inputs and parameters for each subsystem.

My model is simple as below which filters each input channel using Biquad filter and parameters different for each inpurt channel as follows:

the parameters of the biquad filter are read on mask as follows:

where 'a' and 'b' are [2X3] and [3X3] array with each row of 'a' and 'b' are used to design one filter to filter one input channel. There are 3 inputs that are filtered that is why the use of each susbsytem block.

I am able to run this model in simulink but having trouble in generating code:

any help is appreciated!