Automation 4.20.2 error!

UATHelper: Packaging (Windows (64-bit)): ERROR: A conflicting instance of AutomationTool is already running. Curent location: C:\Program Files\Epic Games\UE_4.20\Engine\Binaries\DotNET\AutomationTool.exe. A process manager may be used to determine the conflicting process and what tool may have launched it
PackagingResults: Error: A conflicting instance of AutomationTool is already running. Curent location: C:\Program Files\Epic Games\UE_4.20\Engine\Binaries\DotNET\AutomationTool.exe. A process manager may be used to determine the conflicting process and what tool may have launched it

Can somebody help me please!!!