Following error was detected on my site Byte-Order Mark found in UTF-8 File. The Unicode Byte-Order Mark (BOM) in UTF-8 encoded files is known to cause problems for some text editors and older browsers. You may want to consider avoiding its use until it is better supported. how to resolve?
That's the same as a "Question Mark found in Your File." You don't put the character into the file if it's going to cause a problem. The UTF-8 BOM is 0xEF,0xBB,0xBF. A text editor will display it as . Since BOM has no meaning in UTF-8, the Unicode Standard doesn't recommend inserting it into UTF-8 test. (It only serves to identify the text as being UTF-8.) If it's in a file, just delete it.
Open the file that's causing the problem (it's text) and delete the BOM the same way you'd delete any other character.