title: MSBUILD error where folder contains more than one solution file
body: <p>I'm trying to set up CCNET and I've run into a problem.  </p>
  
  <p>My builds are failing and I'm getting this error</p>
  
  <pre><code>MSBUILD : error MSB1011: Specify which project or solution file to use because this folder contains more than one project or solution file.
  </code></pre>
  
  <p>In my configuration file <code>ccnet.config</code> my <code>msbuild</code> block is as follows</p>
  
  <pre><code>  &lt;msbuild&gt;
    &lt;executable&gt;C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe&lt;/executable&gt;
     &lt;workingDirectory&gt;C:\example\directory&lt;/workingDirectory&gt;
    &lt;projectFile&gt;ExampleSolution.sln&lt;/projectFile&gt;
    &lt;buildArgs&gt;/noconsolelogger /v:quiet
     /p:Configuration=Debug
     /p:ReferencePath="C:\Program Files (x86)\NUnit 2.5.10\bin\net-2.0\"
    &lt;/buildArgs&gt;
    &lt;targets&gt;ReBuild&lt;/targets&gt;
    &lt;timeout&gt;600&lt;/timeout&gt;
    &lt;/msbuild&gt;
  </code></pre>
  
  <p>In this case, C:\example\directory has multiple solution files.  Even though I specified the project file I'm still getting that error.</p>