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This error message indicates that the Python interpreter was unable to import the "_hdfext" module due to a missing DLL (Dynamic Link Library) file. The error message specifically states that the module could not be found, which means that either the DLL file is missing from the system or it is not accessible to the Python interpreter.

To resolve this error, you may need to reinstall the library or package that contains the "_hdfext" module. Alternatively, you could try adding the directory path containing the missing DLL file to the system's "PATH" environment variable so that the Python interpreter can find it.