Somewhere in your production chain you have an editor that's not handling UTF-8 properly and is inserting garbage that's being interpreted as a UTF-16 surrogate. You need to fix this or you'll run into encoding errors again in the future.
To fix the current problem, open the affected file in Notepad++ and use that to convert the encoding (in the Format menu). You may need to track down and change the character that's been mangled by the misbehaving editor.
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