Why does my Simulink model require Fixed-Point Designer toolbox?

I have a Simulink model that uses Deep Learning and Reinforcement Learning toolboxes. I have not used Fixed-point designer in my model. Why do I get an error regarding requiring Fixed-Point Designer toolbox as below?

Error using rl.env.internal.reportSimulinkSimError

License checkout failed.

License Manager Error -5

Cannot find a license for Fixed_Point_Toolbox.

Answer 1

[MathWorks Support Team]

The issue is stemming from creating Fixed-Point data type in the Simulink model.

In order to check your model signals' data type, in the Simulink editor, on the Debug tab, click on the Information Overlays menu and select the "Port Data Type" option for displaying signal properties on the block diagram.

Refer to Displaying Signal Properties for more information about displaying Signal Properties in Simulink.

Note that multiplication of "boolean" and "double" data types in Simulink blocks such as "Gain" blocks results in a fixed-point data type which requires activation of Fixed-Point Designer toolbox.

As a workaround, set the output data type of the relevant blocks (such as "Gain" blocks) as double.

Refer to Specify Data Types Using Data Type Assistant for more information about specifying Signal Data Type.