On 000webhost all html files are parse as PHP whether the extension is html or php and for those that use iWeb or similar which generate html file with the line 1 contain this code:
<?xml version="1.0" encoding="utf-8"?>
Since all html are parse as php and the code above use PHP short tag of <? ?> so it get parse as PHP code but the line is not a valide PHP code so you get the "unexpected T_STRING"
SOLUTION:
To fix this you either set your editor not to use short tag <? ?> for your xml line or don't generate that line or manually remove that line before your upload to your site on 000webhost or upgrade to paid hosting to
hosting24.com