Unit Test : VSTestHost.exe has stopped working. VS2008 Pro - Compact Framework

When trying to execute Unit Testing On a SmartDevice project on Visual Studio 2008 Pro, I get an error "VSTestHost.exe has stopped working".

When debuging the Unit Test, I have the following exception FileNotFoundException

and the stack trace is as follows :

Microsoft.VisualStudio.DeviceConnectivity.Interop.ConManServerClass.DownloadPackage(String pwszPackageId)
at Microsoft.SmartDevice.Connectivity.FileDeployer.DownloadPackage(ObjectId packageId)
at Microsoft.VisualStudio.SmartDevice.TestHostAdapter.DeviceAgent.RunConfigDevice.InitializeStreamingWithDevice()
at Microsoft.VisualStudio.SmartDevice.TestHostAdapter.DeviceAgent.DeviceHostAdapter.initializeInternal()    
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Any suggestions ?