Message Service fatally disconnected

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YUKI GOYA
YUKI GOYA el 1 de Abr. de 2020
Comentada: Maximilian Prilmueller el 13 de En. de 2023
hi,
I am recently seeing the following error popup while running my code in MATLAB R2019b.
JavaScript Alert - https://localhost:31515
Message Service fatally disconnected.
it happens randomly and i would like to know what could be the cause of it and how to fix it.
I never had this issue while running R2014b and it suddenly started when I switched to R2019b. My computer is running under Windows 10 pro (build 1909).
thank you in advance.
yuki
  5 comentarios
Weijie Liu
Weijie Liu el 10 de Oct. de 2020
The same for me. macOS Catalina 10.15.6 with MATLAB R2019b
Amin Salehi
Amin Salehi el 6 de Abr. de 2021
Same here, following, MacOS Big Sir

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Respuestas (1)

Patrik Forssén
Patrik Forssén el 12 de Nov. de 2020
Got this error also and (local) help-pages stoped working. Not even reinstallation of MATLAB (R2020a, Win 10) helped to resolve the issue.
Seems to be a problem with corrupt preferences. After deleting the preferences directory, and reinstallation, help worked again with no error messages (so far). Type
prefdir
in the MATLAB command window, exit MATLAB and delete the preferences directory (WARNING! all your custom settings will be lost). I do not think reinstallation is actually necessary after that, just re-starting MATLAB should be sufficent.
After you have set your custom preferences again you might want to exit MATLAB and save a backup copy of the preferences directory so you can replace it if you experience similar problems again.
  1 comentario
Maximilian Prilmueller
Maximilian Prilmueller el 13 de En. de 2023
I am currently affected by the same error message, however the broken part of the Program is the Editor.
Deleting the preferences did not work.
Running Matlab with administrator rights resolves the issue of not displayed editor, but is not an option for regular use. It is a quick fix, though and might be helpful to other users. Using R2022a currently.

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