I discover that my Gig is not active and i don’t know the reason why this is happening. And please how can I fix this issue.
Welcome to the Fiverr forums.
Is this the page you used to see the status of your gig? https://www.fiverr.com/support_tickets/new/gig?level1=not_searchable
If so, the reason should show up there. If not there, then in the Gigs page while in Seller mode.