running example problem with CORS

I try to run example from editor downloaded, and get this issue.
Access to XMLHttpRequest at 'file:///C:/xampp/htdocs/Editor/controllers/staff.php?=1581480890759' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https./C:/xampp/htdocs/Editor/controllers/staff.php?=1581480890759:1 Failed to load resource: net::ERR_FAILED.

please, somebody help me....