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That usually means your editor saved the file with an extra line break at the beginning or end of the file. Need to reopen it, remove that extra line break, save and re-upload.

Might be worth trying another editor if you don't spot the problem. Note also if BOM is on, you might need to turn it off in your editor.

It's definitely the BOM problem. Open the file in Notepad++, click on Format --> Convert to UTF without BOM. It should fix the case