Error evaluating the initialization for MATLAB S-Function 'slblkCheckFreqChar'

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I'm trying to linearize a simple S-function in Simulink 2018 using Linear Analysis Tool. I've tried solving it many times, but every time it keeps throwing this error:

Error evaluating the initialization for MATLAB S-Function 'slblkCheckFreqChar'. The following is the MATLAB call stack (file names and line numbers) that produced this error: ['C:\Program Files\MATLAB\R2018b\toolbox\shared\spcuilib\unifiedscopes\+matlabshared\+scopes\@UnifiedScope\getExtInst.m'] [3] ['C:\Program Files\MATLAB\R2018b\toolbox\slcontrol\slctrlutil\slblkCheckFreqChar.m'] [79] ['C:\Program Files\MATLAB\R2018b\toolbox\slcontrol\slctrlutil\slblkCheckFreqChar.m'] [6] ['C:\Program Files\MATLAB\R2018b\toolbox\shared\slcontrollib\@opcond\@AbstractOperatingPoint\update.m'] [45] ['C:\Program Files\MATLAB\R2018b\toolbox\shared\slcontrollib\operpoint.m'] [55] ['C:\Program Files\MATLAB\R2018b\toolbox\slcontrol\slctrlguis\+slctrlguis\+lintool\+tabs\@ExactLin\ExactLin.m'] [453] ['C:\Program Files\MATLAB\R2018b\toolbox\slcontrol\slctrlguis\+slctrlguis\+lintool\+tabs\@ExactLin\linearizeModel.m'] [91] ['C:\Program Files\MATLAB\R2018b\toolbox\slcontrol\slctrlguis\+slctrlguis\+lintool\+tabs\@ExactLin\linearizeModel.m'] [23] ['C:\Program Files\MATLAB\R2018b\toolbox\shared\controllib\general\+toolpack\+desktop\ToolGallerySection.m'] [182]

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