Page builder is broken

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Hi, I have been using the Newsri Theme on kiwifinch.com since 2016 and found it great! But it seems that a recent update of visual bakery broke it.
I can access my wordpress normally, but when I open a page, that was built with the page builder I can only edit it with the front end editor. And unfortunately when I try to save the changes I make to the page in the front end editor, these changes are not saved.
The backend editor is broken, I cannot access it.

Pages that don’t use the visual builder I can edit normally. When I save the page I get a cryptic message from WordPress:

“Warning: preg_match_all(): Compilation failed: invalid range in character class at offset 11 in /home/brunnernz/public_html/Kiwifinch.com/wp-content/plugins/js_composer/include/autoload/hook-vc-grid.php on line 162

Warning: Cannot modify header information – headers already sent by (output started at /home/brunnernz/public_html/Kiwifinch.com/wp-content/plugins/js_composer/include/autoload/hook-vc-grid.php:162) in /home/brunnernz/public_html/Kiwifinch.com/wp-admin/post.php on line 231”

In the last couple of months I haven’t touched the page at all. All installed plugins have been there for a long time.

It’s really a pain, because I need to make updates to the pages…
Thanks for your help!

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