Error after installing MATLAB 2021a

Error using builtin

Can't find the resource file 'toolbox/matlab/graphics/hg/hgrc.m' needed by 'E:\bin\win64\hg.dll'

Error in matlab.graphics.internal.initialize (line 15)

suppressedOutput = evalc('builtin(''groot'');');

Error in matlab.internal.doc.services.getDocLanguageLocale (line 11)

sysLang = get(0, 'Language');

Error in matlab.internal.doc.csh.HelpTopicMap.accessDocLanguage (line 65)

docLang = matlab.internal.doc.services.getDocLanguageLocale;

Error in matlab.internal.doc.csh.findDocCatalogFiles>findFilesUnderRoot (line 18)

docLang = matlab.internal.doc.csh.HelpTopicMap.accessDocLanguage;

Error in matlab.internal.doc.csh.findDocCatalogFiles (line 2)

files = findFilesUnderRoot(docroot, catalogFolder, shortname);

Error in matlab.internal.doc.csh.HelpTopicMap/retrieveHelpTargets (line 128)

files = matlab.internal.doc.csh.findDocCatalogFiles("cshapi_helptarget", obj.shortname);

Error in matlab.internal.doc.csh.HelpTopicMap/mapSingleTopic (line 97)

retrieveHelpTargets(obj);

Error in matlab.internal.doc.csh.HelpTopicMap/mapTopic (line 27)

helpPath(i) = mapSingleTopic(obj, topicId(i));

Error in matlab.internal.doc.csh.mapTopic (line 5)

helpPath = helpTopicMap.mapTopic(topicId);

Error in matlab.internal.language.introspective.getExtendedErrorCallback (line 6)

path = matlab.internal.doc.csh.mapTopic(shortname, topicId);

Unrecognized function or variable 'matlab.internal.debugger.breakpoints.initBreakpointsStoreInstance'.

Answer 1

[Ramon Diaz]

Same issue for me... solved by entering the following three commands into MATLAB, one after the other:

>> rehash toolboxcache

>> restoredefaultpath

>> savepath

(solution found from a similar issue addressed here:

https://www.mathworks.com/matlabcentral/answers/468644-can-t-find-the-resource-file-toolbox-local-simulinkrc-m)

I remember doing this when I upgraded from R2019 to R2020 as well.

[Jacobo Martinez-Villa]

Thanks a lot, it worked in 2021a.

[David Minor]

Thanks worked in R2021b

[Scott Miller]

Same, worked for R2021b. Thanks!

[Firat Soylu]

Thanks a lot!

This worked for me on Ubuntu 20.04 & Matlab 2021b, after getting the same error with a fresh installation.

[Antoni]

Thanks a lot! It works in R2022a too.

[Zaida Escila Martínez Moreno]

Hi! I have 2 Matlab versions installed: 2019b and 2021b. I received this error in 2021b out of nowhere today, but before finding your solution, I opened 2019b and it was working perfectly. Then, I used this commands in 2021b and it fixed it, but when I opened 2019b again, now this one had the problem. I fixed it with the same command, but now 2021b is not working...

Basically, when I fix one of my versions with your answer, the other version that was previously working alright now gets the error... What can I do to make both of them work?

[Ramon Diaz]

have you solved this?... why do you need to keep using the older version? Mathworks usually makes sure every new version is backwards compatible

[Zaida Escila Martínez Moreno]

Sorry for such a delay @Ramon Diaz, I just saw your response.

No, I have not solved it. I created a question about it but have received no responses yet: https://www.mathworks.com/matlabcentral/answers/1790405-one-matlab-version-breaks-when-i-fix-errors-in-the-other-one-after-getting-errors-in-startup-unrec?s_tid=prof_contriblnk

I use a script that someone else authored that does not work in 2021b but does in 2019b; however, there is also some new features of 2021b that I like to use when I am working on other scripts, so I need both versions.

[Image Analyst]

Let's fix the old one so that it works with the latest version. Can you attach your old script in a new question so we can fix it?

[Alejandro Blenkmann]

Worked on r2022b too. Thanks!

[Eva Bracey]

Yes, also worked on r2022b. Thank you!

[Julian David]

Also worked on Matlab 2024a. This is th best reponse ever.