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I’m getting a “quarc_library” not found error in my Simulink blocks.

The QUARC Real-Time Control software may not be installed or QUARC may have been installed before MATLAB. If QUARC was not installed, then close MATLAB and install the QUARC Real-Time Control software as instructed in the Quick Installation Guide. If QUARC was installed and MATLAB was installed after, then run the following commands:
cd(fullfile(getenv('QUARC_DIR'), 'quarc'));
This function adds QUARC Targets library to the MATLAB path and updates the MATLAB documentation. It also performs other setup tasks to make QUARC fully functional in MATLAB and Simulink.

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