Hi shaolong,
This error message may indicate an issue with your 'startup.m' file. This file is located in $MATLAB\toolbox\local (where $MATLAB is the MATLAB installation directory). Check if any recent changes were made to this file that could be causing the error. The error message may also indicate the existence of a duplicate 'startup.m' file.
Execute the following command to locate all 'startup.m' files:
>> which -all startup.m
Rename any incorrect file, and restart MATLAB. Check to see if the issue persists. If the issue persists, temporarily rename your 'startup.m' file and restart MATLAB. Again, check to see if the warning message is still generated.
