fix #163

Assets/YooAsset/Editor/AssetBundleBuilder/BuildTasks/ExtdBuildTasks.cs

@@ -22,6 +22,7 @@ namespace UnityEditor.Build.Pipeline.Tasks
         /// <inheritdoc />
         public ReturnCode Run()
         {
+#if UNITY_2020_3_OR_NEWER
             BundleWriteData writeData = (BundleWriteData)writeDataParam;
 
             // 所有图集散图的 guid 集合
@@ -63,6 +64,7 @@ namespace UnityEditor.Build.Pipeline.Tasks
                     }
                 }
             }
+#endif
 
             return ReturnCode.Success;
         }

Assets/YooAsset/Editor/AssetBundleCollector/AssetBundleCollectorWindow.cs

@@ -333,6 +333,7 @@ namespace YooAsset.Editor
 			_showEditorAliasToggle.SetValueWithoutNotify(AssetBundleCollectorSettingData.Setting.ShowEditorAlias);
 
 			// 警示框
+#if UNITY_2020_3_OR_NEWER
 			_helpBoxContainer.Clear();
 			if (_enableAddressableToogle.value && _locationToLowerToogle.value)
 			{
@@ -348,6 +349,7 @@ namespace YooAsset.Editor
 				_helpBoxContainer.style.display = DisplayStyle.Flex;
 			else
 				_helpBoxContainer.style.display = DisplayStyle.None;
+#endif
 
 			// 设置栏
 			if (_showSettings)