Prompt class not found for references between class files under the tp5 framework on the server

for example, the following figure shows the error message and the corresponding file under applicationmobilesupportcontroller

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the namespace of both class files is namespace appmobilesupportController;
Message file with the following use:
use appmobilesupportControllerProject;
use thinkController;

the same situation has happened before, but the files involved are all third-party files and do not inherit the Controller class, so I threw them into the extendlib directory and changed namespace to the corresponding file name of lib,use lib. These files inherit the Controller class.

I would like to ask what is the reason for this and what is the solution?

Feb.28,2021
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