Missing Author and Missing entry title problem

Hello sir, I have been using the viral theme for 6 months since my blog. But I never noticed the error missing_author and missing_entrytitle in the structured data in my search console until my friend said it. I have this error around 200. Searching for the solution in the web however I found the solution by replacing the code php_title with the solution code. But the web said to change the <?php the_author(); ?> and <?php the_date(); ?> in my single.php file. So will you help me how ti fix this problem in your theme?

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