From the error description it seems like MATLAB is not able to open the "mppt1.fis" file. This can be handled in two ways as follows:
1) First load the .fis file into the MATLAB base workspace using the "readfis" function. Then pass it to the "fuzzyLogicDesigner". You can refer the below code for this
fis = readfis("mppt1.fis");
fuzzyLogicDesigner(fis);
2) Directly mention the filepath as a parameter to the "fuzzyLogicDesigner" function. Make sure that the .fis file is on the MATLAB path
fuzzyLogicDesigner("mppt1.fis");
Mention the filename with its extension in the fuzzyLogicDesigner parameter so that the file can be read. Ensure that the file is on the MATLAB path and has appropriate permissions to access it.
For more information on the "readfis" function refer to the below documentation:
I hope it helps.
