Matlab warning: name does not exist or is not a directory

Environmental Science ：
Windows 10
MATLAB2016a
problem ：
open matlab when , Tips “ Warning ： Name does not exist or is not a directory ：( route )”
Here's the picture ：

resolvent ：
1. Type... In the command line window >>edit pathdef.m, enter .
2. stay pathdef.m The directory where the warning occurred was found in the file , Choose , Delete .
3.ctrl+s preservation pathdef.m file .
4. restart matlab.