🇨🇦Canada @krina_t

Running into the same issue.
Drupal Version: D9
Upgrading from Group 8.x.1.5 to v2.
Installed and enabled the Flexible permissions module while being on the group 1.5 version.
Updated group version to 2.0.1

Error on running drush commands:
In CheckExceptionOnInvalidReferenceBehaviorPass.php line 86:
The service "group_permission.calculator" has a dependency on a non-existent service "flexible_permissions.chain_calculator".