OSError: Unable to synchronously open file(file signature not found)

[HNUrookie1]

Hello!
I am currently using your code for a project. However, I have encountered a problem where the mat file cannot be parsed when I run the code. I am not sure what might be causing this issue and would greatly appreciate your help in resolving it.
Local environment: conda 4.12.0

The erros are as follows:

The error file is:

Thank you very much for your attention and assistance.