Why is the error that the class does not exist reported here?

Reply content:

Looking at your URL path prompt, it should be the index method under the course controller under the admin module. Your screenshot is under the model. There should be a problem with the location you checked.

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Update:
Looking at the screenshots, I still can’t find the problem. You should be able to find the problem from the error location in. Due to program limitations, the error cannot be debugged. I downloaded the thinkphp5 program from the official website and ran it locally. I simply wrote two lines of code and the model file under common can be loaded normally. The screenshot is as follows:

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Tried it