I cannot build to android Unity 2017.1.1f1 (Unable to List Target Platforms)

I have tried using Unity 5.6, Unity 2017 1.1f1, and the Unity Beta 2017.2.0f2 and I get the same error each time. I have the latest Android Studio, SDK, Java JDK, and Win 10. I have the correct paths in Unity that lead to the SDK and JDK. Everything in the program works perfectly, testing is done, I'm ready to market, and, yes, I've even done this before. But I cannot build my apk due to this system error.

Traditionally, this error is caused by a clash between Android Studio Tools and Unity. I have tried all the known workarounds that I can find (installing older versions of SDK Tools, older versions of Unity, beta versions of Unity, etc). I've been reading the manual, the forums, and the many workaround solutions. I've been swapping files and reinstalling everything for the last couple days and I just cannot get beyond this. The old workarounds are not working for me.

Does anyone know a way around this? Nothing theoretical, I want the Unity and Android Studio version pair that are actually allowing you to build right now. If you have a working Unity-AndroidStudio pair, I can, at least, figure out if it is just me or not.

Thanks!

Error follows: CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details. D:/Java/jdk-9\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="D:/Android/sdk\tools" -Dfile.encoding=UTF8 -jar "D:\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[ Error:Invalid command android ] stdout[

] exit code: 64 UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.HostView:OnGUI()

Error building Player: CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details. D:/Java/jdk-9\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="D:/Android/sdk\tools" -Dfile.encoding=UTF8 -jar "D:\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[ Error:Invalid command android ] stdout[

] exit code: 64

UnityEditor.BuildPlayerWindow+BuildMethodException: Build failed with errors. at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x001b9] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:162 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00050] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:83 UnityEditor.HostView:OnGUI()