Item Error "unable to get tile"

I'm having trouble with one of my items. On some - but not all - sprite interactions the game crashes and says "Fatal: Unable to get tile named "letter"". At first I thought it was on interactions involving "Letter++" but it isn't that, the interaction that seems to be causing it is

	else
		say "You sit down and read the Reply to the Letter.{embed:letter}" at 5,10,15,3
		Reply--
	end

Does anyone know what might be causing this, or how to fix it?
Thanks

You're using both letter and Letter there - try using "{embed:Letter}" with a capital L, if that's the name of your tile?

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