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please help me to solve these errors
I dont know exactly, my be below me wil answer your question
It's difficult.let us see who can do that.
If you have error on all your pages, it means it is a repeated code. You will fix it once and it will apply to all your website! It shown that it has author tag missing. Search Google for that for a detailed tuto; it is a simple task where you add your site at Google and link Google on your website!
You are using metadata and miss the required tags; it is better to do add it at all if it is not complete!