Error while initializing a simulink parameter with a matlab structure

I am following the steps in the link to create a parameter object that I can use to initialize my Bus Signal. Initialize Bus signals I have custom defined Bus objects, I use the Bus Editor's "Create a Simulink.Parameter object" option by selection my desired Bus definition and get an m-file that creates a IC Structure and a parameter with initial value equal to the created structure. However when I run that m-file I get the following error: _ _Invalid Value specified for parameter object. Value must be a numeric array, fi object, an enumerated value, or a scalar structure whose fields contain valid values ._ _ Any suggestions on resolving this are appreciated. Regards. Anup.

Note: My bus structure has 4 levels of nesting and one of them is an array of bus.