title: Could not load file or assembly 'GalaSoft.MvvmLight.Platform, PublicKeyToken=null' or one of its dependencies
body: <p>I'm facing an annoying problem. Before I started using , everything went on smoothly. But tonight when I was trying to introduce into my View (which is a WPF Window)</p>
  
  <pre><code>                      &lt;i:Interaction.Triggers&gt;
                          &lt;i:EventTrigger
                              EventName="SelectionChanged"&gt;
                              &lt;mvvm:EventToCommand
                                  Command="{Binding OnCategoryChangedCommand}"
                                  CommandParameter="{Binding SelectedItem, ElementName=comboBoxCategory}" /&gt;
                              &lt;!--todo 数据绑定写入绑定源先触发？还是事件触发器先触发？--&gt;
                          &lt;/i:EventTrigger&gt;
                      &lt;/i:Interaction.Triggers&gt;
  </code></pre>
  
  <p>Just ignore the Chinese content. :) 
  I have correctly introduced the right namespaces like this:</p>
  
  <pre><code>    xmlns:mvvm="http://www.galasoft.ch/mvvmlight"
  xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
  </code></pre>
  
  <p>And I <strong>succeeded</strong> building.
   I started debugging (This project is not a WPF application, it's an Autodesk add-in dev project. So debugging starts from an Autodesk software). 
  I click a button to trigger my Window, and immediately an exception was thrown: </p>
  
  <pre><code>Could not load file or assembly 'GalaSoft.MvvmLight.Platform, PublicKeyToken=null' or one of its dependencies.
  </code></pre>
  
  <p>You can see the <strong>"PublicKeyToken=null"</strong>, because at the 1st time I faced this problem, I googled for this question, and got a solution of changing into MVVMLightStd10. I tried, and still got the above exception. Can anyone help? Thank you very much!</p>