Generally the error 'cannot be found on MATLAB's search path, or is shadowed by another file with the same name.' is received when there is a user defined function in the MATLAB search path which has the same name as the MATLAB built-in function. In order to resolve the issue follow the troubleshooting steps below:
a) Manually go through the MATLAB search path and remove the paths which have functions conflicting with inbuilt MATLAB functions. Execute the following command to get the list of the current search path.
The following command may help to find the source of the issue:
>> which -all <conflicting_function>
b) If you are unsure of which paths to remove or the above command displays only one line, restore the MATLAB search path to its factory-installed state by executing the following command :
Notice that the above command may remove the paths that you have previously added to MATLAB search path in order for your scripts to work. So it is advisable to save a backup copy of the current MATLAB search path before running the command.
You can refer to the following link to the documentation to backup the current search path: