hi there is only documentation in Spanish
Información general y preguntas frecuentes sobre IARC en el modo Creativo de Fortnite | Modo Creativo de Fortnite Documentación | Epic Developer Community
and in English
IARC Overview and FAQs in Fortnite Creative | Fortnite Creative Documentation | Epic Developer Community
The only thing you can do is contact Fortnite Support and send them the picture of error because its a epic server error
Support request
Please vote this up to get escalation or document how to fix this