Segui todos os passos das aulas, porém meu gráfico do JSON não funciona. No Chrome aparece o seguinte erro: Access to XMLHttpRequest at 'file:///C:/Users/Jo%C3%A3o%20A.%20Hauptmam/Desktop/Gr%C3%A1ficos%20Web%20I/dados.json' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
E no Firefox aparece este: XML Parsing Error: not well-formed Location: file:///C:/Users/Jo%C3%A3o%20A.%20Hauptmam/Desktop/Gr%C3%A1ficos%20Web%20I/dados.json Line Number 1, Column 1:
O que isso quer dizer?