Error in default port dimensions function of S-function 'slaveV2/S​laveI2C/Ch​art'. This function does not fully set the dimensions of output port 3

hi everyone,

I'm trying to design an I2C slave using stetflow, and then to make an IP Core generation of it using HDL Workflow Advisor, to implement on an fpga. so I have my boolean scl and sda signals... the problem is i get this weird error, that I can't solve, to me it seems all is fine and it worked well when signals were of type uint8!

apparently dimensions of output port 3 which is adrR, is not fully set, I don't really understand what does that mean because dimensions are good and fine in the model explorer: adrR is meant to be a [1, 7] vector, which is the case. I have attached the simulink project ,

Thank you very much for the precious help,