Windows 10 Matlab suddenly won't open

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While I was working on Matlab, my computer crashed (it does this every now and again, it's an old windows HP laptop), but when I rebooted the laptop, the current version of Matlab won't open up: I click on the icon, it briefly flashes and then nothing happens. The previous versions still works fine, so it's not urgent, but obviously I'd want to be able to keep working on the current version.
Thanks!
  11 Comments
Erik Huuki
Erik Huuki on 13 Aug 2021
I had this problem on mac and after I ran the activation again it opened fine after. Be sure to allow access to documents

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Accepted Answer

Bhargav Kinnal
Bhargav Kinnal on 3 May 2019
  25 Comments
Maurício Andrade
Maurício Andrade on 17 Nov 2022 at 11:44
:D It worked for me, too!!!!

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More Answers (5)

dumblydoop
dumblydoop on 29 Nov 2018
I had the same problem. Deleting my preferences folder did the trick, as described in the solution here:https://www.mathworks.com/matlabcentral/answers/97167-why-will-matlab-not-start-up-properly-on-my-windows-based-system
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milad hasani
milad hasani on 21 Aug 2020
I suggest that install a last update on your installed matlab version:
For example 2018a:
I tried this and fixed it.

Gagandeep Sharma
Gagandeep Sharma on 21 Jul 2019
Following message is appearing on command window on start of the Matlab 2019b
java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(File.java:1012)
at com.mathworks.services.Prefs.readMigrateFlag(Prefs.java:2153)
at com.mathworks.services.Prefs.createTwoWayMapPrefsSettings(Prefs.java:373)
at com.mathworks.services.Prefs.<clinit>(Prefs.java:214)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.mathworks.util.PostVMInit$StartupClass.init(PostVMInit.java:156)
at com.mathworks.util.PostVMInit.perform(PostVMInit.java:187)
Please advice what I have to do

Gagandeep Sharma
Gagandeep Sharma on 21 Jul 2019
On trying to start simulink following message is prompting
> simulink
Cannot write to preference file "matlab.prf" in "C:\MATLAB_preferences ".
Check file permissions.
An error was encountered while saving the command history
java.io.FileNotFoundException: C:\MATLAB_preferences \History.xml (The system cannot find the path specified)
at java.io.RandomAccessFile.open0(Native Method)
at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243)
at com.mathworks.mde.cmdhist.AltHistoryCollection$CommandSaver.run(AltHistoryCollection.java:1214)
at java.lang.Thread.run(Thread.java:748)
java322
simulink
simulink
Undefined function or variable 'java322'.
Cannot write to preference file "matlab.prf" in "C:\MATLAB_preferences ".
Check file permissions.
An error was encountered opening file C:\MATLAB_preferences \History.xml
An error was encountered while saving the command history
java.io.FileNotFoundException: C:\MATLAB_preferences \History.xml (The system cannot find the path specified)
at java.io.RandomAccessFile.open0(Native Method)
at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243)
at com.mathworks.mde.cmdhist.AltHistoryCollection$CommandSaver.run(AltHistoryCollection.java:1214)
at java.lang.Thread.run(Thread.java:748)

César Augusto Páez Betancourt
Edited: César Augusto Páez Betancourt on 7 Oct 2019
Just hit the old restart button on your pc. It worked for me...

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