ThemeConfig not found

Same thing and it fills my log

If you turn off your sites Aggregate JavaScript files in Performance it shoudl go back to normal

When I disable "Aggregate JavaScript files",the problem persists.
When I disable "Aggregate CSS files", the problem is gone!

The "Aggregate JavaScript files" can be disabled or enabled: No effect on the problem.

isn't that a pretty significant problem?

I faced a similar issue today in different file while upgrading from Drupal 9.5.11 to Drupal 10.1.6

Class "Drupal\\at_core\\Theme\\ThemeConfig" not found" at web/themes/contrib/adaptivetheme/at_core/includes/preprocess.inc at line 27

I had uninstalled at_tool → module
For me it is resolved after installing the module.

I faced this issue today after upgrading to Drupal 10.1.6

Class "Drupal\\at_core\\Theme\\ThemeConfig" not found" at web/themes/contrib/adaptivetheme/at_core/includes/preprocess.inc on line no. 27.

I had uninstalled at_tool → module.
For me it fixed after installing at_tool.

I am having this same issue

I also encountered this same situation. The home page had WSOD.

This happened after creating an example PayPal payment method.

Disabling css and js aggregation, then clearing cache, did not fix.
Disabling at_tool and at_theme_generator did fix.

After re-enabling at_tool, the WSOD was still fixed. (AT theme generator was not re-enabled since it was no longer needed.)

Drupal version ..... 10.2.6
PHP version ............ 8.1.28
at_tool ................... 3.1.2
at_theme_generator 3.1.2
commerce_paypal .. 8.x-1.7
commerce ............. 8.x-2.39

Error: Class "Drupal\at_core\Theme\ThemeConfig" not found in at_core_preprocess() (line 27 of .../adaptivetheme/at_core/includes/preprocess.inc).