Build failed

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********** DEPLOY COMMAND STARTED **********
WARNING: Win64 does not implement Deploy…
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Starting Client…
ERROR: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.Collections.Generic.List1.get_Item(Int32 index) at Project.SetupClientParams(List1 DeployContextList, ProjectParams Params, String ClientLogFile, ERunOptions& ClientRunFlags, String& ClientApp, String& ClientCmdLine) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Scripts\RunProjectCommand.Automation.cs:line 633
at Project.RunInternal(ProjectParams Params, String ServerLogFile, String ClientLogFile) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Scripts\RunProjectCommand.Automation.cs:line 173
at Project.Run(ProjectParams Params) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Scripts\RunProjectCommand.Automation.cs:line 115
at BuildCookRun.DoBuildCookRun(ProjectParams Params) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Scripts\BuildCookRun.Automation.cs:line 224
at BuildCookRun.ExecuteBuild() in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Scripts\BuildCookRun.Automation.cs:line 41
at AutomationTool.BuildCommand.Execute() in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\AutomationUtils\BuildCommand.cs:line 112
at AutomationTool.Automation.Execute(List1 CommandsToExecute, Dictionary2 Commands) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\AutomationUtils\Automation.cs:line 562
at AutomationTool.Automation.Process(String[] Arguments, StartupTraceListener StartupListener) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\AutomationUtils\Automation.cs:line 532
at AutomationTool.Program.MainProc(String[] Arguments, StartupTraceListener StartupListener) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Program.cs:line 174
at AutomationTool.Program.<>c__DisplayClass1_0.b__0() in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Program.cs:line 100
at AutomationTool.InternalUtils.RunSingleInstance(Func`1 Main) in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\AutomationUtils\Utils.cs:line 725
at AutomationTool.Program.Main() in D:\Build++UE4\Sync\Saved\CsTools\Engine\Source\Programs\AutomationTool\Program.cs:line 100
(see C:\Users\xxuserxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.20\Log.txt for full exception trace)
AutomationTool exiting with ExitCode=1 (Error_Unknown)
BUILD FAILED

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