Post-build event causing an exit code of 1

I have the following post-build event in my web application in Visual Studio.

"..............\External\Tools\ILMerge\2.10.0\ILMerge" /out:"$(ProjectDir)$(OutDir)Combined.dll" "$(TargetPath)" "$(ProjectDir)$(OutDir)Utilities.dll" "$(ProjectDir)$(OutDir)AjaxMin.dll" "$(ProjectDir)$(OutDir)Yahoo.Yui.Compressor.dll" "$(ProjectDir)$(OutDir)EcmaScript.NET.modified.dll"

It's causing an exit code 开发者_如何学Goof 1. Any ideas why this might be the case?

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