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MILEFFECTSERR_NOINPUTSOURCEATTACHED
What MILEFFECTSERR_NOINPUTSOURCEATTACHED actually isolates
MILEFFECTSERR_NOINPUTSOURCEATTACHED reports that a DirectComposition/MIL effect is evaluated without the required input source attached. The useful diagnostic unit is the exact object and operation, not the product name alone.
Keep these facts stable
record effect object, expected input slot, source visual/surface, graph construction order, and the call that evaluates or connects the effect.
Corrective test
attach the intended source to the required input before evaluation and verify the same effect graph without rebuilding unrelated visuals. Avoid broad reinstalls or policy changes until that controlled test changes the result.
Technical references
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