This is making FiveReborn unplayable.
Which server are you joining? It might be a problem with the server
This is a server problem, it states that the request for a custom vehicle that the server owner put, has timed out, meaning it didn’t reach you and ergo it won’t let you in that specific server. My guess would be the server owner has to remove his “cache” folder, check his custom vehicle folder which he is trying to stream for any problems and restart the server. Maybe even open up some ports.