It is hard to debug the model without actually seeing it, but I will give it a try. The output of the AD9361 receiver is a complex digital baseband signal. If the output of the model is connected to a block that expects a real signal at its input (like for example a analog filter), then Simulink will try to propagate backwards the data type of the signal, and you will experience an error.
I recommend to enable "display-> signal and ports -> port data types from the Simulink toolbar in the model to debug the different data types.
You can comment the blocks connected at the output of the model and progressively figure out what causes the data type inconsistency.
I hope this helps,