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TF215097: An error occurred while initializing a build for build definition: Cannot create unknown type

While creating some custom build activities for TFS Build I ran into this error

TF215097: An error occurred while initializing a build for build definition \OrdinaALM\TestBuild: Cannot create unknown type '{clr-namespace=Ordina.CustomActivities;assembly=Ordina.CustomActivities}Ndepend'.

I discovered that my solution couldn't be loaded because TFS is looking for a particular attribute to my class. As my custom activity was completely build in XAML I had to use a partial class definition to get the attribute added. 

namespace Ordina.CustomActivities
{
	[Microsoft.TeamFoundation.Build.Client.BuildActivity(Microsoft.TeamFoundation.Build.Client.HostEnvironmentOption.All)] 
	partial class Ndepend
	{
	}
}
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