Symbolic Toolbox error: mustBeComp​atibleRefe​renceStruc​t

In MATLAB desktop app (not in MATLAB Online) this error started appearing:

What's the matter? I am using version 2020b.

[Walter Roberson]

Do you happen to have Maple installed?

[Carlos M. Velez S.]

I don't have it. Thanks.

[Steven Lord]

What does this command show in your MATLAB installation?

which -all mustBeCompatibleReferenceStruct

Can you also post the output of the following command (you can omit the line showing the license number) so we can make sure you're using the correct version of the toolbox for your release?

ver symbolic

[Carlos M. Velez S.]

Hi. The commands shows these messages:

I did not installed anything and I did not have any problem before. I use an institutional PC and I can not install any program. How can I solve the issue? Thanks.

Answer 1

[Jinal]

Hi Carlos,

As per my understanding you are facing an error while using the ‘syms’ command despite having the correct version of symbolic toolbox installed on your PC. The error you are getting indicates that the code for the function ‘mustbecompatibleReferencestruct’ is either missing or not accessible to the function ‘subsref’. A possible explanation for this is that the code for the 'syms' tool has been modified on your PC.

You can try using the following commands to resolve the error.

restoredefaultpath
rehash toolboxcache

If the error persists after running these commands, you will be required to reinstall the symbolic toolbox for your MATLAB from the Add-Ons Manager.

Hope this helps.

[Carlos M. Velez S.]

Thank you very much.

The solution was using restoredefaultpath and rehash toolboxcache.