Obimy app error_link what it means?

so here when i have this invitation from ubimi app i see this message error link i don't know why is that what it means my suggestion is that so yeah i sent this link invitation to get friends but maybe it's just expired so maybe invitation expired because it was like on april 11th maybe it's just this link is valid only for few hours or one day or something like that so if you see this message our link our link it means usually i think might be that the link just expired and you need to send another link