Initialization commands cannot be evaluated

I have designed a compensator in the sisotool using premade G and H blocks in matlab using the tf(num,den) commands. After launching sisotool and designing the controller with the requirements I need, I cannot export it to simulink.

I get the following error:

Error using

Error using

ctrlguis.csdesignerapp.data.architectures.internal.Config1Architecture/drawDiagram_

(line 142)

Error in 'Feedback_Configuration_1_3/Compensator': Initialization commands

cannot be evaluated.

Warning: Error occurred while evaluating listener callback.

The values for C F G H are different, the ones I wrote myself in the command window (G and H) have "1x1 tf" value, while the ones designed in sisotool have the value "1x1 zpk".

What is the issue here?