Francesco Casella

First and foremost, we should update matio in MSL 4.1.0, given what wrote here I really think it doesn't make sense to wait for MSL 4.2.0 to upgrade 1.5.24 to...

> So could we please be honest and recognise the current state and stop making false promises? That's all what this PR is about. You can still update the security...

@JayHuLBL where do we find the corrected model? Could you please post the code that allows to replicate the issue? Thanks!

@hkiel are you interested because of some specific application?

Adding @matteodepascali to the loop

Partially addressed by #13031. Now [fails](https://libraries.openmodelica.org/branches/newInst-newBackend/SOFCPoliMi/files/SOFCPoliMi_SOFCPoliMi.Tests.BenchmarkCammarata.err) with ``` Error: Internal error NBResolveSingularities.noIndexReduction failed. ``` which may be expected because the experiment is set up with fixed pressure boundary condition that...

This [commit](https://github.com/looms-polimi/SOFCPoliMi/commit/74ae525ae855ca247e4c8f3e42da7c4bee05729e) added an index-1 test to the library. Job 8564 should test that. Results will be available [here](https://libraries.openmodelica.org/branches/newInst-newBackend/SOFCPoliMi/SOFCPoliMi.html).

Now [all tests](https://libraries.openmodelica.org/branches/newInst-newBackend/SOFCPoliMi/SOFCPoliMi.html), regardless of their index, fail with the same error: ``` Error: Internal error NBResolveSingularities.noIndexReduction failed. (6|6) Unmatched Variables *************************** ... (117|654) Unmatched Equations ******************************* ... ```

You can find smaller examples failing with the same error in the EHPTexamples library, e.g. [EHPTexamples.EV.FirstEV](https://libraries.openmodelica.org/branches/newInst-newBackend/EHPTexamples/files/EHPTexamples_EHPTexamples.EV.FirstEV.err): ``` Error: Internal error NBResolveSingularities.noIndexReduction failed. (2|2) Unmatched Variables *************************** [ALGB] (1) Real mass.a...

@kabdelhak, [SOFCPoliMi.Tests.BenchmarkCammarata](https://libraries.openmodelica.org/branches/newInst-newBackend/SOFCPoliMi/files/SOFCPoliMi_SOFCPoliMi.Tests.BenchmarkCammarata.err) is known to be index-2. Please try with [SOFCPoliMi.Tests.BenchmarkCammarataIndex1](https://libraries.openmodelica.org/branches/newInst-newBackend/SOFCPoliMi/files/SOFCPoliMi_SOFCPoliMi.Tests.BenchmarkCammarataIndex1.err), if you haven't already done it.