I think the IoErrorEvent has information about the file name, at least in its message. Just parse the message and you will know which file is failed to load.
I noticed that but it's not so good to me. Is there a way to load synchronously?
If you really want to load synchronously, just load image by image sequentially. In listeners of Event.COMPLETE and IOErrorEvent.IO_ERROR of the image 1, put an invocation to load image 2, and so on. Therefore you can keep the order of images.
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You can load Image one by one so when one finishes or load successfully you can trigger the load on the next one. How are you loading multiple images anyway you using a bulk loader class or multiple url loaders?