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I don't see anything obviously wrong with your launch file.

"Line 1, column 0" is the first character in your launch file. I see a <, which should be valid, but perhaps you have a non-printing character in the file or something?

You can try to confirm by looking at a binary dump of the file (try hexdump -C mylaunch.launch).

You can also just create a new launch file, and retype the whole thing. (Don't copy/paste. there's a decent chance you'll copy the offending character into the new file)