Merhaba Arkadaşlar Unity 2018.4.18f1 sürümü ile yapılmış bir oyun var elimde

Bunu Unity 2021 ile açtığımda hatalar alıyorum.

- Library/PackageCache/com.unity.purchasing@4.0.3/Runtime/WinRTStub/Factory.cs(15,23): error CS0433: The type 'IWindowsIAP' exists in both 'UnityEngine.Purchasing.WinRTCore, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' and 'winrt, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
-Library/PackageCache/com.unity.purchasing@4.0.3/Runtime/SecurityStub/GooglePlayReceipt.cs(32,35): error CS0433: The type 'IPurchaseReceipt' exists in both 'Security, Version=1.0.7807.33496, Culture=neutral, PublicKeyToken=null' and 'UnityEngine.Purchasing.SecurityCore, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'
- Error building Player because scripts have compile errors in the editor

Bu hataları nasıl giderebilirim