CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details.
/usr/lib/jvm/java-8-oracle/bin/java -Xmx2048M -Dcom.android.sdkmanager.toolsdir="/home/elmapul/Android/Sdk/tools" -Dfile.encoding=UTF8 -jar "/home/elmapul/Downloads/uni/unity-editor-5.6.0xf1Linux/Editor/Data/PlaybackEngines/AndroidPlayer/Tools/sdktools.jar" -

stderr[
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at SDKMain.main(SDKMain.java:129)
Caused by: java.lang.NoSuchMethodError: com.android.sdklib.AndroidVersion.<init>(Ljava/util/Properties;)V
    at com.android.sdklib.repository.local.LocalSdk.scanPlatforms(LocalSdk.java:962)
    at com.android.sdklib.repository.local.LocalSdk.getPkgsInfos(LocalSdk.java:562)
    at com.android.sdklib.repository.local.LocalSdk.getTargets(LocalSdk.java:708)
    at com.android.sdklib.SdkManager.getTargets(SdkManager.java:181)
    at com.android.sdkmanager.Main.displayTargetList(Main.java:968)
    at com.android.sdkmanager.Main.doAction(Main.java:318)
    at com.android.sdkmanager.Main.run(Main.java:151)
    at com.android.sdkmanager.Main.main(Main.java:117)
    ... 5 more
]
stdout[

]
exit code: 1
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()