"Switch" blocks support bus signals, however there is a limitation: Hierarchies and element names of both bus inputs must be identical.
You have two options to resolve this error:
1. Rename the input signals to the "Bus Creator" block so that they match the Bus definition (you may have to do this for both "Bus Creator" blocks)
2. Un-check the following "Bus Creator" block parameter ("checked" by default):
Un-checking the parameter will strictly enforce the output signal names to match the bus definition, regardless of the input signal names.
