This thread is resolved. Here is a description of the problem and solution.
Problem:
The issue here is that the user is getting the fatal error
An error of type E_PARSE was caused in line 66 of the file /XXX/wp-content/plugins/wp-views/application/controllers/cache/meta/manager.php.
After they updated their views plugin to 2.8.1 Solution:
Our team was aware of this issue and we've recently released our views version 2.8.1.1 which should resolve this issue for you.
Whilst not critical to me right now, the update caused my site to stop working:
==================
Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
In this case, WordPress caught an error with one of your plugins, Toolset Views.
An error of type E_PARSE was caused in line 66 of the file /home/milfordassociate/teesdalelocal.co.uk/wp-content/plugins/wp-views/application/controllers/cache/meta/manager.php. Error message: syntax error, unexpected ‘::’ (T_PAAMAYIM_NEKUDOTAYIM)
===================
I did, however see another error on another site although that site appears to be functioning fine (as far as I can see).
I thought it best to report it just in case there is another glitch somewhere.
Kind regards
Tony
The error was:
First, visit your website (hidden link) and check for any visible issues. Next, visit the page where the error was caught (hidden link) and check for any visible issues.
Error Details
=============
An error of type E_ERROR was caused in line 16 of the file /home/tdswcorg/public_html/wp-content/plugins/types/vendor/toolset/toolset-common/inc/autoloaded/field/group.php. Error message: Interface 'OTGS\Toolset\Common\PublicAPI\CustomFieldGroup' not found