I don't think it's an error. The first packet is probably lost while the router or switch is performing an arp request. That takes a second or two to come back, then the pings are successful. If you ping again (immediately after the first time when you loose one packet) you shouldn't see any dropped packets, unless there's another problem. That's because the router or switch is holding that arp entry. Wait a while and try again and you'll loose the first packet again, because the arp entry has aged out.
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