build error. please help me fix..stuck since two weeks!

hi.. I am trying to build my scene. I first thought its got to do with the current project, Ive tried creating new projects and get the same error each time I try to build, even with one scene. getting these 5 errors in console. I have spent hours reading different answers and I dont understand what to do, or how to know if I have any duplicate plugins . I am trying to build for Android platform, installed android sdk, Min API level (android 7.0 Nougat) , VR Supported for Daydream, as thats the headset I have to build for, and i am using Version 2018.2.9f1 Would appreciate some help here. please let me know if any more details are needed. 1.

Error:Invalid command dx

UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

1. CommandInvokationFailure: Unable to convert classes into dex format. C:/Program Files (x86)/Java/jdk1.8.0_171\bin\java.exe -Xmx1024M -Dcom.android.sdkmanager.toolsdir="C:/Users/juhus_000/AppData/Local/Android/Sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\2018.2.9f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[ Error:Invalid command dx ] stdout[

] exit code: 64 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) 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.RunCommand (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg, Int32 memoryMB) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Build completed with a result of 'Failed' UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

4. UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:187 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:94 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

IndexOutOfRangeException: Array index is out of range. UnityEditor.Android.AndroidBuildWindowExtension.GetBuildPlayerWindow () UnityEditor.Android.AndroidBuildWindowExtension.RepaintTargetList () UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at C:/buildslave/unity/build/Editor/Mono/EditorApplication.cs:191)