iamsaranraj
It doesn't look like you've installed properly.
Running nginx instead of Apache is fine but I bet that you're running MySQL instead of MariaDB based on the version number which is causing these errors.
It also looks like you haven't got Git setup properly as there's no commit I'd. I assume you just copied the files instead of doing a git clone?
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Did you actually follow the manual instructions from start to finish, or just selectively follow some bits?