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Error with no line number and class: “Object reference not set to an instance of an object.”

When I am publishing my ASP.NET website, VS 2010 shows an error:

Error 1 Object reference not set to an instance of an object.

There is not neither a class name nor a line number.

What could cause this error?

Another point, the web site works with no error when debugging.

After restarting Visual Studio, the error message has gone. Thanks to C Baurer

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