Also there is no information about unknown symbol name in dialog message, so this is also beautiful that I know that I have a lot of unknown symbols in my NYSE list if I don't know their instrument names neither. And I'm really not going to look for broken symbols in 4000 instrument list.
So my recommendation is to collect list of unknown instruments while downloading instruments data and at the end of download process display list of collected unkown symbols with ability to remove them from instrument list or some another useful features.
Thanks for understand
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