Error Message Deprecated function: strnatcasecmp(): Passing null to parameter #2 ($string2) of type string is deprecated in Drupal\Core\Layout\LayoutPluginManager->Drupal\Core\Layout\{closure}() (line 204 of core/lib/Drupal/Core/Layout/LayoutPluginManager

@mukesh-kumar3, thanks for the report. Just adding a reminder that is it good practice to search for duplicate issues before creating a new one. Apologies if you did that and missed it.

This look like a duplicate of 🐛 Add missing category to Drupal\layout_builder\Plugin\Layout\BlankLayout and let modules and themes alter the list of layouts RTBC