Error while updating my wordpress

  • A few days ago ive tried to update my wordpress from an earlier version. My site is hosted on 000webhost. I wanted to update the wordpress trough the site interface (not manual update it), but after i started the update it just got stuck there.

    now when i access my site i get there errors:

    PHP Error Message

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'check_theme_switched' was given in /home/a6847684/public_html/wp-includes/plugin.php on line 405

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PHP Error Message

Fatal error: Call to undefined method WP_Styles::get_data() in /home/a6847684/public_html/wp-includes/class.wp-styles.php on line 113

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    i looked up my problem in google, and it seemed that i had to delete the “upgrade” folder from my “Wp-content”, or delete the .maintenance file, but none of that worked.

    any suggestions what can i do?

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