You don't have enough proxies in the file most likely.
Maybe the Run number is set to more than one when there is only 10 proxies.
It is hard to say without seeing the script
IPV6 Proxy parsing error
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Description:
BAS unable to parse IPV6 Proxy. Attaching screenshot.(https://imgur.com/a/70UXJic)
BAS version: 25.3.8
OS version: Win 11