problem with converting a detail from part to sheet metal

I needed to convert this part to sheetmetal (so I could flatten it). I keep getting error telling me something about non-sheet metal faces. Maybe someone knows a way around this?

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2 Answers

Steps
1 new sketch draw circle on plane for outside diameter
2 new sketch draw circle on plane for inside diameter
3 Draw helix using outside diameter (1 revolution or less)
4 Draw helix using inside diameter (1 revolution or less)
5 new 3D skech convety entities outside helix
6 new 3D skech convety entities inside helix
7 Sheetmetal loft between two 3D sketches

More than one revolution in the helix will not let you flatten pattern

 
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