"Launch failed!" when launching a level

Development Platform & Builds
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1

When launching a level, I get an error message.

Full log :

LogPlayLevel:Display:
BuildCommand.Execute: ERROR: BUILD
FAILED

LogPlayLevel:Display: Program.Main:
ERROR: AutomationTool terminated with
exception:

LogPlayLevel:Display: Program.Main:
ERROR: Exception in AutomationTool:
You are attempting to compile on a
machine that does not have a supported
compiler!

LogPlayLevel:Display: Stacktrace:
at
AutomationTool.UE4Build.Build(BuildAgenda
Agenda, Nullable`1
InDeleteBuildProducts, Boolean
InUpdateVersionFiles, Boolean
InForceNoXGE, Boolean InForceNonUnity,
Boolean InForceUnity)

LogPlayLevel:Display: at
Project.Build(BuildCommand Command,
ProjectParams Params, Int32 WorkingCL)

LogPlayLevel:Display: at
BuildCookRun.DoBuildCookRun(ProjectParams
Params)

LogPlayLevel:Display: at
BuildCommand.Execute()

LogPlayLevel:Display: at
AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands)

LogPlayLevel:Display: at
AutomationTool.Automation.Process(String
CommandLine)

LogPlayLevel:Display: at
AutomationTool.Program.MainProc(Object
Param)

LogPlayLevel:Display: at
AutomationTool.InternalUtils.RunSingleInstance(MainProc
Main, Object Param)

LogPlayLevel:Display: at
AutomationTool.Program.Main()

LogPlayLevel:Display: Program.Main:
ERROR: You are attempting to compile
on a machine that does not have a
supported compiler!

LogPlayLevel:Display: copying UAT log
files…

LogPlayLevel:Display: RunUAT.bat
ERROR: AutomationTool was unable to
run successfully.

LogPlayLevel:Display: BUILD FAILED

The level can’t be launched.

2

Looks like I have the same problem. Unfortunaly I can see the answer to your problem. Where can I find it?