I guess it’s because of ESI v4 Character Route Removed - Please Update to V5
You can simply update from v4 to v5 in
forum\ext\snitch\authevesso\classes\esi\lib\Api\CharacterApi.php
Change line #325 to $resourcePath = ‘/v5/characters/{character_id}/’;
You can do that with other version changes too. I didn’t had any problems.