Error on uninstall

Problem/Motivation

The website encountered an unexpected error. Please try again later.
Error: Using $this when not in object context in Drupal\commerce_pagseguro_transp\Form\PrepareModulesEntityUninstallForm::moduleBatchFinished() (line 261 of modules/contrib/commerce_pagseguro_transp/src/Form/PrepareModulesEntityUninstallForm.php).

We can't use $this in a static method.

Proposed resolution

Use \Drupal::messenger()