What does the error "the exec task needs a command to execute" mean?

C#.NetExceptionCompiler Construction

C# Problem Overview

When compiling a project in Visual Studio, the error message "the exec task needs a command to execute" appears, with no line number. What does this error mean?

(Apologies for asking and answering my own question; I just found an answer as I was writing this. Have made it community wiki, so as not to offend.)

C# Solutions

Solution 1 - C#

Ken Egozi has found an answer.

The message is caused by stray newline characters in pre or post build commands.

Solution 2 - C#

That link is no longer good.
HERE is a new link.

And here is a pertinent quote from the blog:
"After pooling out a few hairs, I remembers that I recently have edited the pre-build actions for this project. Looking this up, I found that I left a spare newline at the end of the pre-build script. So VS2005 sent msbuild an order to run an empty command."

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionRichie CottonView Question on Stackoverflow
Solution 1 - C#Richie CottonView Answer on Stackoverflow
Solution 2 - C#claudekennilolView Answer on Stackoverflow