Error on matlab get_param

I'm generating tlc files from a model. In a specific point I'm getting this error when calling get_param:

    >> get_param('FGCS_Sim', 'TargetFcnLibHandle')

??? Error using ==> getTfl at 30 TFL: "None" cannot be found in the registry.

Error in ==>
C:\MATLAB\R2008b\toolbox\rtw\rtw\@RTW\@TargetRegistry\getTflTableList.p>getTflTableList at 18

??? Target Function Library 'None' is missing or does not contain a valid TFL Table.

This error is occurring in `.p` file, so I can't see what's happening. But when I try with a different parameter name (one that does not exist), I get a "normal" error:

    >> get_param('FGCS_Sim', 'foo_boo_bar')

??? block_diagram does not have a parameter named 'foo_boo_bar'.

What could be happening?

[Walter Roberson]

You could experiment with the method given at https://www.mathworks.com/matlabcentral/answers/94901-why-do-i-receive-an-error-message-about-tfl-ipp-in-simulink-7-5-r2010a

[Joao Paulo Oliveira Fernandes]

I tried this one. Didn't work :(