failure of wordpress 3.7 update

  • failure of up-to-date wordpress 3.7, in /wp-admin/network/update-core.php

    Warning: copy(/var/www/wp-includes/class-phpass.php): failed to open stream: Permission denied in /var/www/wp-admin/includes/class-wp-filesystem-direct.php on line 200 Warning: copy(/var/www/wp-includes/class-phpass.php): failed to open stream: Permission denied in /var/www/wp-admin/includes/class-wp-filesystem-direct.php on line 200 Notice: Undefined variable: checksums in /var/www/wp-admin/includes/update-core.php on line 753

    Désactivation du mode maintenance (Disable maintenance mode)…

    Impossible de copier le fichier (Unable to copy file).: wp-includes/class-phpass.php

    After appear on:

    /wp-admin/ widget>jetpack stats:
    Fatal error: Call to undefined function mbstring_binary_safe_encoding() in /var/www/wp-includes/class-http.php on line 170

    /wp-admin/plugins.php
    Fatal error: Call to undefined function mbstring_binary_safe_encoding() in /var/www/wp-includes/class-http.php on line 170

    Help! How to correct this! Please?

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Viewing 3 replies - 1 through 3 (of 3 total)
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