Utf-8

getting the following error when executing file upload in form
A form was submitted in the windows-1252 encoding which cannot encode all Unicode characters, so user input may get corrupted. To avoid this problem, the page should be changed so that the form is submitted in the UTF-8 encoding either by changing the encoding of the page itself to UTF-8 or by specifying accept-charset=utf-8 on the form element.
...,data:this.ajaxForm,success:function(data,textStatus,XMLHttpRequest){var respObj...
RunnerAll.js (line 1065)

how do i modify to correct the issue

TIA

GAB