Error from iOS device. undefined variable. Irritants: (yail/format)

Recently after the update, my old project suddenly got problem. could somebody tell me what's wrong with the code?

It works fine if you load it from android but when i tested it in iOS, it shows Runtime Error message. please help.
GalleryViewer.aia (576.8 KB)

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yes, i've searched through that. That ticket problem happened in March so i thought it should be fixed already. My current problem actually happening right after the November update. Actually most of my project suddenly have error which previously running just fine.

Maybe this is a new bug which is why iam creating a new post.

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