I am not sure about the entire technical details of the Model that you are trying to simulate. However, this might be a possible resolution.
- Try making use of ‘Complex-to-Real-Image' converter block and then connect the Real outport of the converter to the blocks or ports which are dependent on this signal in the model.
- To find the appropriate location to connect the block, click on the error and it would re-route you to the exact location.
- The logic behind using this converter is that sometimes certain blocks do not accept complex numbers as inputs and therefore we can consider splitting the signal into real and imaginary parts.
