Fatal Error relating to sessions.php

I fixed it by:

1) checking wordpress version in: /home/myusername/public_html/version.php

2) downloading this version package from wordpress website

3) addingwp-includes/session.php file from downloaded package into /home/myusername/public_html/wp-includes/session.php (that file was empty or not existing)

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)