Erreur ''CORS policy: No 'Access-Control-Allow-Origin''

Bonjour
j'ai applique SSL sur mon serveur et depuis mon site affiche dans la console cette erreur

Failed to load resource: net::ERR_FAILED
Access to XMLHttpRequest at 'htpps://... 'from origin
"htpps://..." has been blocked by CORS policy: No 'Access-Control-Allow-Origin'
header is present on the requested resource.