Incorrect plug-in installation: Make sure that the automatic lip-synching plug-in is installed correctly and put it in the AE plug-in directory.
AE Version Incompatible: Make sure that the automatic lip-synching plug-in is compatible with AE version. If you are using an older AE version, you may not be able to use newer plug-ins.
Lack of necessary resources: Plug-ins may need to access other resources to work properly, such as fonts or audio files. Ensure that these resources are available and configured correctly.
Lack of necessary library files: Some plug-ins depend on other library files to work properly. Please ensure that these library files are installed correctly and available.
Plug-in conflicts: Some plug-ins may conflict with automatic lip-synching plug-ins. Try to disable other plug-ins and then reload the automatic lip-synching plug-in.
If you still can't solve the problem by trying the above methods, you can try to uninstall and reinstall the automatic lip-synching plug-in. If the problem persists, you can contact the plug-in manufacturer for more help.