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hlsl assistance

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I am writing a shader with FX composer that uses multiple passes. If i keep my technique 1 pass the shader compiles fine, but if I add a second pass in the shader i get a compiler error saying that "Input semantic POSITION is invalid". It makes absolutely no sense to me. I am simply using the same vertex shader both passes and applying a 2nd pixel shader on the 2nd pass. Can anyone possibly tell me why this error might be occurring? any ideas/advice would be appreciated!

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