Android build problem!

I'm trying to build an apk for android, and although i have everything set up fine (updated all packages in sdk manager, got the android-sdk folder in D:/ etc.) But everytime i have to look for the android sdk folder again, and when selecting it i get the following error message and it stops building.

Exception: Error building Player: Win32Exception: ApplicationName='java.exe', CommandLine='-Dcom.android.sdkmanager.toolsdir="D:/Android/android-sdk\tools" -classpath "D:/Android/android-sdk\tools\lib\sdkmanager.jar" com.android.sdkmanager.Main list targets', CurrentDirectory='' UnityEditor.BuildPlayerWindow.BuildPlayerWithDefaultSettings (Boolean askForBuildLocation, BuildOptions forceOptions) (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/BuildPlayerWindow.cs:367) UnityEditor.BuildPlayerWindow.GUIBuildButtons (Boolean enableBuildButton, Boolean enableBuildAndRunButton, Boolean canInstallInBuildFolder) (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/BuildPlayerWindow.cs:972) UnityEditor.BuildPlayerWindow.ShowBuildTargetSettings () (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/BuildPlayerWindow.cs:953) UnityEditor.BuildPlayerWindow.OnGUI () (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/BuildPlayerWindow.cs:726) System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/GUI/DockArea.cs:225) UnityEditor.HostView.Invoke (System.String methodName) (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/GUI/DockArea.cs:218) UnityEditor.HostView.OnGUI () (at C:/BuildAgent/work/842f9557127e852/Editor/Mono/GUI/DockArea.cs:119)

If anyone has had this before and/or knows a solution to this please let me know