Code generation for property ‘Items’ failed. Error

I am receiving this error message now and then on my machine.
Microsoft Visual Studio
Code generation for property ‘Items’ failed. Error was: ‘Object reference not set to an instance of an object.’
Occasionally, when I try to edit the SDF controls on my Windows Vista machine, which has Microsoft Visual Studio 2008 installed on, throws an error message.
Has anyone else also experienced the same error message on their environment?
