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Getting TypeError in the drush generated rest resource

I generated a plugin using

drush generate plugin:example

Enabled the module.

Now when I go to Config > Web Services > Rest, I am getting error and the log message is TypeError: get_class_methods(): Argument #1 ($object_or_class) must be an object or a valid class name, string given in get_class_methods() (line 158 of /drupal9/web/modules/contrib/restui/src/Controller/RestUIController.php)

How do I fix this issue?

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Getting TypeError in the drush generated rest resource

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