Blender

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Hey Helljumper, I am pretty awesome at modeling and I just wanted to say that your tutorials are really excellent. I do have one question though; When opening blender, I get an error message that reads "source.sdk has encountered an error 001XX21 and will now close". I do not understand why this happens, I have replaced the blades on my blender maybe 27 times now with no warranty from Sears. I have tried Ace Hardware but all they sell are bags of manure and that's pretty ♥♥♥♥♥♥ news for me. Pun intended. Anyhow any advice on blade purchasing/availability would be nice as I would like to continue blending models.