title: Assembly must be registered in isolation error
body: <p>I'm trying to load a custom workflow activity onto a crm server.  I loaded the project onto the server and have been using the CRM Plug-in Registration Tool.  The server is CRM2011 and thus supports .NET 4.0 activities.  However, when I press the "Register" button (After the assembly has successfully loaded onto the Tool) the following error occurs:</p>
  
  <pre><code>`Unhandled Exception: System.ServiceModel.FaultException'1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Action failed for assembly 'ExecuteSQLJob, Version=1.0.0.0, Culture=neutral, PublicKeyToken=914788311ab3af7d': **Assembly must be registered in isolation**.
  Detail: &lt;OrganizationServiceFault xmlns="http://schemas.microsoft.com/xrm/2011/Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"&gt;
    &lt;ErrorCode&gt;-2147220906&lt;/ErrorCode&gt;
    &lt;ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" /&gt;
    &lt;Message&gt;Action failed for assembly 'ExecuteSQLJob, Version=1.0.0.0, Culture=neutral, PublicKeyToken=914788311ab3af7d': Assembly must be registered in isolation.&lt;/Message&gt;
    &lt;Timestamp&gt;2012-06-21T19:50:30.5216535Z&lt;/Timestamp&gt;
    &lt;InnerFault&gt;
      &lt;ErrorCode&gt;-2147220906&lt;/ErrorCode&gt;
      &lt;ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" /&gt;
      &lt;Message&gt;Action failed for assembly 'ExecuteSQLJob, Version=1.0.0.0, Culture=neutral, PublicKeyToken=914788311ab3af7d': Assembly must be registered in isolation.&lt;/Message&gt;
      &lt;Timestamp&gt;2012-06-21T19:50:30.5216535Z&lt;/Timestamp&gt;
      &lt;InnerFault i:nil="true" /&gt;
      &lt;TraceText i:nil="true" /&gt;
    &lt;/InnerFault&gt;
    &lt;TraceText i:nil="true" /&gt;
  &lt;/OrganizationServiceFault&gt;`
  
  `Server stack trace: 
     at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc&amp; rpc)
     at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
     at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)`
  
  `Exception rethrown at [0]: 
     at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
     at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&amp; msgData, Int32 type)
     at Microsoft.Xrm.Sdk.IOrganizationService.Create(Entity entity)
     at Microsoft.Xrm.Sdk.Client.OrganizationServiceProxy.CreateCore(Entity entity)
     at PluginRegistrationTool.RegistrationHelper.RegisterAssembly(CrmOrganization org, String pathToAssembly, CrmPluginAssembly assembly) in C:\hbs\apps\prod\hbs\downloads\crm2011\crm2011_MicrosoftDynamicsCRM2011SDK\sdk\tools\pluginregistration\RegistrationHelper.cs:line 227
     at PluginRegistrationTool.PluginRegistrationForm.btnRegister_Click(Object sender, EventArgs e) in C:\hbs\apps\prod\hbs\downloads\crm2011\crm2011_MicrosoftDynamicsCRM2011SDK\sdk\tools\pluginregistration\PluginRegistrationForm.cs:line 452`
  </code></pre>
  
  <p>What does registering in isolation mean?  Is it simply a matter of where the assembly is saved on the server or is it more complicated?</p>
  
  <p>I've been following MSDN's tutorial's so far but can't find an explanation for this.</p>
  
  <p>Thanks!</p>