LogPlayLevel: Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Failed to delete file 'C:\UnrealEngine\Engine\Binaries\DotNET\UnrealBuildTool.exe'

Development Getting Started & Setup
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1

I often see the following error during packaging:

LogPlayLevel: Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Failed to delete file 'C:\UnrealEngine\Engine\Binaries\DotNET\UnrealBuildTool.exe'

The file is not write protected and as far as I can see has no special permissions set (running windows 7).

2

Trying to delete this file lead me to the solution. There seems to be some hanging copies of this running. End-tasking or using some unlocker program to kill UnrealBuildTool.exe processes solved it for me.

This seems to happen consistently after cancelling a build from visual studio.