nft 0.8..2 - maps - Error: Could not process rule: Device or resource busy

[ѽ҉ᶬḳ℠ <vtol@xxxxxxx>]

Not sure whether there is an error in the syntax  but it keeps on
popping up this error:

nft -c -f /etc/fw/test
/etc/fw/test:6:7-9: Error: Could not process rule: Device or resource busy
  map vpn {
      ^^^
_________________

#!/usr/sbin/nft -f

flush ruleset

table nat {
  map vpn {
  type inet_service : ipv4_addr
  elements = { 61023:179.x.x.x, 61023:172.25.120.2 }
  }
    chain prerouting {
        type nat hook prerouting priority 0;
        dnat tcp dport map @vpn
    }
    chain postrouting {
        type nat hook postrouting priority 100;
        meta oif ens3 masquerade
    }
}


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