In my case, this message is printed when the function [UIImage initWithContentsOfFile:cache:] called.
This may be some other image upload function. (I found this by adding the Symbolic Breakpoint function - "puts".)
It appears that some information about the JPEG image is invalid or the Apple image decoder is not processing correctly.
I think this problem can be ignored if all goes well.
In any case, when I re-saved all the images using another image editor, this message disappeared.
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