“Headers already sent” is not a WordPress error, it is PHP processing error message. Good explanation here; https://stackoverflow.com/questions/8028957/how-to-fix-headers-already-sent-error-in-php .
I suspect it might be caused by some characters (probably space characters) sent before your <?php code segment. Even space (or tab [code formatting] ) characters will cause an error.
And perhaps move your <ul> code to just above the while loop.
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