Simulink trying to map struct to run-time parameter

When attempting to run a function inside a Simulink model the simulation always fails due to the following error:

Unable to map parameter 'VarName' in 'FunctionName' to a run-time parameter. This parameter is an unsupported variable class such as a string, structure, cell, or an unsupported data type.

VarName is indeed a struct, but I do not understand why Simulink is attempting to make it a run-time parameter. VarName contains the initial conditions and online parameters used throughout the simulation. The Simulink model was built in 2013a and I am attempting to update it to run in 2017b. How can I prevent this error from occuring?

Thanks in advance.

Answer 1

[Marshall Trout]

Unsure what the actual cause was, but a windows update seems to have cleared up the error.

[Toheed Ghandriz]

I got the same error but it was solved after removing the check mark in front of 'Tunable' in Edit data dialog box for 'VarName'. My VarName was structure too.

[Hong Yang]

Thank you, Toheed Ghandriz !

[Toshiyuki]

Thank you, Toheed! Your answer was helpful in resolving the issue.

Answer 2

[Noah Tang]

I was able to reproduce the same error message, and the comparison shows that the error happens when one field of my struct variable has an empty array as its value. Otherwise, the parameter passing process works just fine.