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Warning: Private methods cannot be final as they are never overridden by other classes during compilation

I successfully installed the Martfury-Marketplace Magento theme. Subsequently, I executed the command ‘php bin/magento setup:di:compile’, however, an error occurred as follows:
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Therefore, I fixed the issue by adhering to the following guide:-
Deprecated Functionality: Optional parameter $data declared

After fixed it,
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I re-executed the command ‘php bin/magento setup:di:compile’ but, another error occured as follows:
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Info.php on line 83
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Section.php on line 164
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Anyone can help me ?