Cryptographic failure in WPF Reports v0.4 alpha

I just downloaded the WPF Reports v0.4 alpha

When I build the project in VS 2008 I got the following error.

Cryptographic failure while signing assembly ' \CodeReason.Repor开发者_开发百科ts\obj\Debug
   \CodeReason.Reports.dll' -- 'Access is denied. ' CodeReason.Reports.VS2008

What is this error mean and how can I resolve this?

This can happen on Vista/Windows 7 when your account does not have permissions to he MachineKeys directory.

Just grant your user full control to folder %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\MachineKeys

Original source: http://blog.devstone.com/aaron/2005/12/01/AccessDeniedWhileSigningAssembly.aspx