As per my understanding you are trying to transform Simulink.bus object to Simulink Bus elements ports. This is achievable using Bus Creator.
The error you are encountering generally occurs when the parameter “Output Data Type” is set to a non-default value. You can follow the steps mentioned below to set the “Output Data Type” of the Bus Creator:
1. Open the Block Parameters of Bus Creator by double clicking on the bus creator block. 
From the dropdown on “Output Data Type” select “Inherit: auto” this will automatically set the output bus element ports name and type.
2. You can also choose “Bus <object name>” from the dropdown and replace the <object name> with the name of the object.
You can also check the options such as “require names of inputs to match names above” for custom checks.
Kindly refer to the below documentation to learn more about the Bus creator :
