Why do i receive an error using open (line 143) while open my simulink model?

When i try to open simulink model file appears an 'error dialog' window, which shows message:"Error using open(line 143) 'file path' is not a valid simulink model file: could not open source package". I have R2021b version, on the other computer this file opens well with the same version of matlab.

[Walter Roberson]

Wait, you are trying to imread() a .slx file ???

Answer 1

[Walter Roberson]

That file is not a valid Simulink model.

Simulink .slx files are internally a zip'd directory containing mostly .XML files. However, that file is not in any recognized archive format that I am able to detect.

[Ilya]

Then why does this file open properly on the other computer ?

[Walter Roberson]

Perhaps when they open, they are opening a different file. MATLAB follows the path in opening simulink models.

If they were to use

which -all Car_model

then they would not necessarily show the same file you are using.

If you were to look at the binary of Simulink models, all models start with 0x50 0x4b which is the characters 'PK' . However, the file you posted here starts with 0xd3 0xb1 which gets into the UTF-8 Surrogate Pairs encoding range and would encode 'ӱ'

[Ilya]

Could it happen that when i sent the file from computer where it opens well the binary code crash or something ? And if it could happen, can it be restored ?

[Walter Roberson]

Something could have gone wrong with the copy, Yes. It would not be typical, but it can happen.

You should try copying the file again.

[Ilya]

Is the right coding for matlab window-1251 ?

[Walter Roberson]

The .slx file is not a valid Simulink model under any encoding.

fid = fopen('testmodel.slx', 'r'); first2 = fread(fid, [1 2], 'char*1=>char'); fclose(fid); first2, dex2hex(first2)

Will output 'PK' for potentially-valid simulink models, and '50' '4B' for the hex part.

For the file you posted, the output is instead 'Ó±' and 'D3' 'B1'

This is not a matter of window-1251 versus UTF-8 . The PK is a "magic number" used to signal that what follows is (potentially) a PKZip-style zipped file, that will be internally unzipped to find the details of the model. With your file not having that at all, there is no possibility that your posted file is a valid Simulink model.