【发布时间】：2019-06-16 16:23:18
【问题描述】：
每次我尝试打开播放器设置时，它只会显示空白。并且控制台会显示下面的错误。
我已尝试点击此链接：https://answers.unity.com/questions/1320634/unable-to-list-target-platforms-when-i-try-to-buil.html 但是还是不行。
CommandInvokationFailure：更新 Android SDK 包列表失败。 /Applications/Unity/Hub/Editor/2019.2.0b1/PlaybackEngines/AndroidPlayer/SDK/tools/bin/sdkmanager --list
标准错误[ 线程“主”java.lang.NoClassDefFoundError 中的异常：javax/xml/bind/annotation/XmlSchema 在 com.android.repository.api.SchemaModule$SchemaModuleVersion.(SchemaModule.java:156) 在 com.android.repository.api.SchemaModule.(SchemaModule.java:75) 在 com.android.sdklib.repository.AndroidSdkHandler.(AndroidSdkHandler.java:81) 在 com.android.sdklib.tool.SdkManagerCli.main(SdkManagerCli.java:103) 引起：java.lang.ClassNotFoundException：javax.xml.bind.annotation.XmlSchema 在 java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) 在 java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) 在 java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ... 4 更多 ] 标准输出[
] 退出代码：1 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (在 :0) UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (在 :0) UnityEditor.Android.SDKManager.UpdatePackagesList () (在 :0) UnityEditor.Android.SDKManager.HighestVersionInstalled（UnityEditor.Android.SDKManager+组件工具）（在:0） UnityEditor.Android.AndroidPlatformIconProvider.GetCurrentSetAndroidSDKVersion () (在 :0) UnityEditor.Android.AndroidPlatformIconProvider.UpdateSDKVersion () (在 :0) UnityEditor.Android.AndroidPlatformIconProvider.get_targetSDKSupportsAdaptiveIcons () (在 :0) UnityEditor.Android.PlayerSettingsEditorExtension.IconSectionGUI () (在 :0) UnityEditor.PlayerSettingsEditor.IconSectionGUI (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.Modules.ISettingEditorExtension settingsExtension, System.Int32 sectionIndex) (在/Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/PlayerSettingsEditor/PlayerSettingsEditor.cs:803) unityEditor.PlayerSettingsEditor.OnInspectorGUI () (在/Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/PlayerSettingsEditor/PlayerSettingsEditor.cs:573) UnityEditor.AssetSettingsProvider.OnGUI (System.String searchContext) (在 /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/Providers/AssetSettingsProvider.cs:94) UnityEditor.SettingsWindow.DrawControls () (在 /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:322) unityEditor.SettingsWindow.DrawSettingsPanel () (在/Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:313) UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize) (在/Users/builduser/buildslave/unity/build/Modules/UIElements/ IMGUIContainer.cs:281) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
之前，我可以看到一些选项，以便我可以尝试构建。
【问题讨论】：
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你能告诉我你是怎么解决这个问题的吗？