HI, having just updated to Jetpack 8 I too got the same error message:
An error of type E_ERROR was caused in line 270 of the file /home/sites/8a/3/3ee973aac8/public_html/wp-content/plugins/jetpack/vendor/automattic/jetpack-sync/src/Listener.php. Error message: Class ‘Automattic\Jetpack\Roles’ not found
My site appears unaffected. However when now going to my dashboard i cannot access anything and it looks like this, just a list and nothing functions properly and therefore I am unable to remove the jetpack plug in:
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Dashboard
Dashboard
Home
Updates 0
Jetpack
Jetpack
Dashboard
Settings
Site Stats
Akismet Anti-Spam
Posts
Posts
All Posts
Add New
Categories
Tags
Pages
Pages
All Pages
Add New
Events
Events
Event Posts
Add New
Event Categories
Galleries
Galleries
Gallery Posts
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Gallery Categories
Slideshows
Slideshows
Slideshow Posts
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Slideshow Categories
Testimonials
Testimonials
Testimonial Posts
Any ideas ?? 🙁