Trying to enable "Import custom code" option and the box is greyed out and will not let me enable.

I am trying to run a simulink multibody system that uses a time based function as input for the position of a revolute joint. I am using the clock function and the Matlab function block. It gives me the error below, but when I follow the link and try to change the setting the box is greyed out and I cannot enable "Import Custom Code".

C Caller block 'RightArm90ByPositionInputUserDefinedFunctionAddedRE/Right Elbow Joint/User-Defined Functions/C Caller' requires model to have associated importable custom code. There is no custom code specified, or 'Import custom code' is disabled.

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You may add custom code dependency to model 'simulink'Open

Enable 'Import custom code' for model 'simulink'

[David Balbuena]

Hi Dieter,

Can you attach your model? Or at least provide a copy of the configuration set you are using?

-David