matlab intrinsic function call fails with "Invalid text character" error

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A.B.
A.B. 2020-5-15
编辑： Fangliang Bai 2020-7-4
I have recently installed MATLAB and I get the following error with some of MATLAB intrinsic functions, such as the following:
usejava('desktop')
Error: File: system_dependent.m Line: 1 Column: 24
Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.
What is the source of this error and how can it be resolved?
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Walter Roberson
Walter Roberson 2020-5-15
Use your system file explorer to find system_dependent.m looking first under your own files and then under the MATLAB installation directory. What do you find?
Basically, you should not find any system_dependent.m as it is an undocumented built-in function.
A.B.
A.B. 2020-5-15
编辑：A.B. 2020-5-15
that solved it! thanks a bunch... there was apparently another copy of this file hidden somewhere in the directories, I do not know how it got there, but I basically removed the whole directory and now the error is gone. perhaps you'd want to write your comment as a separate answer so that I can accept it as the correct answer.

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Walter Roberson
Walter Roberson 2020-5-15
Use your system file explorer to find system_dependent.m looking first under your own files and then under the MATLAB installation directory. What do you find?
Basically, you should not find any system_dependent.m as it is an undocumented built-in function.
  1 个评论
Fangliang Bai
Fangliang Bai 2020-7-4
编辑：Fangliang Bai 2020-7-4
This solved my problem. Thanks Walter.
In my case, it turns out that the system_dependent.m was located under my own Matalb App folder that has a Runtime. Delete that folder or remove it from the Matlab setpath should solve this problem.
To locate the system_dependent.m, you cannot click the file in the error message because it will throw the same error again. Instead, you can move your mouse over that file in the error message, the Matlab status bar at the bottom of the window should give you the full path to that file.

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