Thank you for your question. As per your error:
Fatal error: Call to undefined function get_current_blog_id() in /home/cultur27/public_html/wp-content/plugins/kebo-twitter-feed/inc/widget.php on line 9
This problem looks to be caused by the kebo-twitter-feed widget, I recommend disabling it.
Since you cannot access your Wordpress site, you can disable this plugin by renaming the folder. Here is a link to a full walk-through guide on how to accomplish this.
After, renaming disabling the plugin, you should be able to access your website again. I recommend checking if there is a different version of the plugin, or a similar plugin you could use.
If you have any further questions, feel free to post them below.
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