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Sometimes you will receive messages like "invalid byte 1 of 1-byte utf-8 sequence". This is caused by copying and pasting XML from other programs and the byte sequence messing up. The solution is to copy the text, e.g. from a web browser, into a program that can save the text specifically in UTF format, e.g. Notepad, then copy the text from that program into ContentXML. This should correct any UTF byte sequence problems.