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copied!<p><strong>UPDATE</strong>:</p> <p>If you're still getting this error, you're using an out-of-date version of log4net and you should consider updating to the <a href="http://logging.apache.org/log4net/download_log4net.cgi" rel="nofollow noreferrer">current version</a>, which does not require the full .NET 4.0 framework. Thanks to <a href="https://stackoverflow.com/users/35274/philippe">@Philippe</a> for pointing this out in a comment.</p> <hr> <p>Your project is referencing the .NET 4.0 <em>client profile</em> which does not include System.Web; you actually need to reference the <em>full</em> framework.</p> <p>See <a href="http://msdn.microsoft.com/en-us/library/bb398202.aspx" rel="nofollow noreferrer">How To: Target a Specific .NET Framework Version or Profile</a> on MSDN for directions.</p> <blockquote> <ol> <li>In Visual Studio, open the project you want to change.</li> <li>Right-click the project in Solution Explorer and then click Properties.</li> <li><p>In the Project Designer, locate the Target Framework list, as follows.</p> <ul> <li>For Visual Basic projects, click the Compile tab and then click Advanced Compile Options. The Target Framework list is in the Advanced Compiler Settings dialog box.</li> <li>For Visual C# projects, the Target Framework list is on the Application tab of the Project Designer. For more information, see Application Page, Project Designer (C#).</li> <li>For Visual F# projects, the Target Framework list is on the Application tab of the Project Designer.</li> </ul></li> <li><p>In the Target Framework list, select the .NET Framework version or profile that you want. When you click OK, the project unloads and then reloads in the integrated development environment (IDE). The project now targets the .NET Framework version that you just selected.</p></li> </ol> </blockquote> <p>Possibly also of interest is <a href="http://msdn.microsoft.com/en-us/library/cc668079.aspx" rel="nofollow noreferrer">Troubleshooting .NET Framework Targeting Errors</a>.</p>

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