Same line error in line 96 – multiple files – Cannot modify header info

Ok so I have been deleting spaces after the ?> line for a while now and every time I delet it in one spot, it shows up in another spot on the same line. Went through admin pages, plug-ins and so forth and there is always a new problem in another spot at the same line.

Any universal fix to this? So far I have edited 20 files in the same spot in different folders.

Am I on the right path or is there a simpler fix to what I’m doing?