iptables list command with very verbose option generates `ERROR' [64]

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Can someone explain the meaning of "Target name: `ERROR' [64]"? The error is generated from running the iptables list command with the 'very verbose' option for every custom 'Target name' used in my iptables script. Two blocks from the output are shown below with the errors highlighted by the arrows. I have a basic understanding of iptables, though I haven't seen any documentation that details the 'very verbose' output. I have googled "Target name: `ERROR' [64]" and it appears the last block containing "error='ERROR'" is commonly generated from other customized scripts, though I haven't seen any mention or concern about the error message. In any case, my custom script appears to function properly. Any help is appreciated.

iptables -Ln -vv

=========================OUTPUT=====================
.
.
.
SRC IP: 0.0.0.0/0.0.0.0
DST IP: 0.0.0.0/0.0.0.0
Interface: `'/................to `'/................
Protocol: 0
Flags: 00
Invflags: 00
Counters: 0 packets, 0 bytes
Cache: 00000000
Target name: `ERROR' [64] <<<<<
error=`IN_ACC' <<<<<
.
.
.
SRC IP: 0.0.0.0/0.0.0.0 (LAST BLOCK)
DST IP: 0.0.0.0/0.0.0.0
Interface: `'/................to `'/................
Protocol: 0
Flags: 00
Invflags: 00
Counters: 0 packets, 0 bytes
Cache: 00000000
Target name: `ERROR' [64] <<<<<
error=`ERROR' <<<<<

=====================END OF OUTPUT==================
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