드론예제 관련 오류 질문드립니다

안녕하세요, 유니티 강의 잘 듣고있습니다.

다름이 아니라 [드론환경 실행 및 환경 빌드] 에서 드론팩을 import하고 나서 visual studio에 코드를 작성하고 난 뒤에 에러가 떠서 질문남깁니다..

Assets\Drone\Script\DroneAgent.cs(10,13): error CS0246: The type or namespace name 'PA_DroneController' could not be found (are you missing a using directive or an assembly reference?)

Assets\ProfessionalAssets\DronePack\Scripts\CameraTeleportEffect.cs(9,21): error CS1069: The type name 'ParticleSystem' could not be found in the namespace 'UnityEngine'. This type has been forwarded to assembly 'UnityEngine.ParticleSystemModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' Enable the built in package 'Particle System' in the Package Manager window to fix this error.

Assets\ProfessionalAssets\DronePack\Scripts\ProximityCannon.cs(16,17): error CS1069: The type name 'AudioSource' could not be found in the namespace 'UnityEngine'. This type has been forwarded to assembly 'UnityEngine.AudioModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' Enable the built in package 'Audio' in the Package Manager window to fix this error.

Assets\ProfessionalAssets\DronePack\Scripts\PAVR_DroneRemote.cs(10,14): error CS1069: The type name 'XRNodeState' could not be found in the namespace 'UnityEngine.XR'. This type has been forwarded to assembly 'UnityEngine.XRModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' Enable the built in package 'XR' in the Package Manager window to fix this error.

Assets\ProfessionalAssets\DronePack\Scripts\Turbine.cs(14,17): error CS1069: The type name 'ParticleSystem' could not be found in the namespace 'UnityEngine'. This type has been forwarded to assembly 'UnityEngine.ParticleSystemModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' Enable the built in package 'Particle System' in the Package Manager window to fix this error.