The PI Controller shown in the 1st figure is used in the 2nd figure to simulate a model of PID heat exchanger controller.
Error in port widths or dimensions. Output port 1 of 'Paper2/Transport Delay HE' is a one dimensional vector with 2 elements.
Error in port widths or dimensions. Invalid dimension has been specified for input port 1 of 'Paper2/Heat Exchanger'.
How can I remove these errors?