Need help, cannot access dashboard

I can’t access to my dashboard or manage page because it says this:

Fatal error: Call to undefined function wp_get_current_user() in /home/content/p3pnexwpnas06_data02/88/2296388/html/wp-includes/capabilities.php on line 1353

Fatal error: Call to undefined function is_user_logged_in() in /home/content/p3pnexwpnas06_data02/88/2296388/html/wp-content/plugins/wp-photo-album-plus/wppa-users.php on line 43

I don’t really know what to do! I think I should try to eliminate the plugin but I don’t know how if I can get in…

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