Panics on startup with called Result::unwrap() on an Err value: UnsupportedSegwitFlag(0)

[octobocto]

When I run cargo run, the enforcer panics on startup:

Listening for gRPC on 127.0.0.1:50051
thread 'tokio-runtime-worker' panicked at src/bip300.rs:677:62:
called `Result::unwrap()` on an `Err` value: UnsupportedSegwitFlag(0)
stack backtrace:
   0: rust_begin_unwind
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:74:14
   2: core::result::unwrap_failed
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/result.rs:1679:5
   3: core::result::Result<T,E>::unwrap
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/result.rs:1102:23
   4: bip300301_enforcer::bip300::Bip300::initial_sync
             at ./src/bip300.rs:677:25
   5: bip300301_enforcer::bip300::Bip300::task::{{closure}}
             at ./src/bip300.rs:771:9
   6: <F as futures_core::future::TryFuture>::try_poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-core-0.3.30/src/future.rs:82:9
   7: <futures_util::future::try_future::into_future::IntoFuture<Fut> as core::future::future::Future>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/try_future/into_future.rs:34:9
   8: <futures_util::future::future::map::Map<Fut,F> as core::future::future::Future>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/future/map.rs:55:37
   9: <futures_util::future::future::Map<Fut,F> as core::future::future::Future>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/lib.rs:91:13
  10: <futures_util::future::try_future::UnwrapOrElse<Fut,F> as core::future::future::Future>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/lib.rs:91:13
  11: bip300301_enforcer::bip300::Bip300::run::{{closure}}
             at ./src/bip300.rs:784:18
  12: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/core.rs:331:17
  13: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/loom/std/unsafe_cell.rs:16:9
  14: tokio::runtime::task::core::Core<T,S>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/core.rs:320:13
  15: tokio::runtime::task::harness::poll_future::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:500:19
  16: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panic/unwind_safe.rs:272:9
  17: std::panicking::try::do_call
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:557:40
  18: ___rust_try
  19: std::panicking::try
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:521:19
  20: std::panic::catch_unwind
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panic.rs:350:14
  21: tokio::runtime::task::harness::poll_future
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:488:18
  22: tokio::runtime::task::harness::Harness<T,S>::poll_inner
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:209:27
  23: tokio::runtime::task::harness::Harness<T,S>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:154:15
  24: tokio::runtime::task::raw::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/raw.rs:271:5
  25: tokio::runtime::task::raw::RawTask::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/raw.rs:201:18
  26: tokio::runtime::task::LocalNotified<S>::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/mod.rs:436:9
  27: tokio::runtime::scheduler::multi_thread::worker::Context::run_task::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:598:13
  28: tokio::runtime::coop::with_budget
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/coop.rs:107:5
  29: tokio::runtime::coop::budget
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/coop.rs:73:5
  30: tokio::runtime::scheduler::multi_thread::worker::Context::run_task
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:597:9
  31: tokio::runtime::scheduler::multi_thread::worker::Context::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:548:24
  32: tokio::runtime::scheduler::multi_thread::worker::run::{{closure}}::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:513:21
  33: tokio::runtime::context::scoped::Scoped<T>::set
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context/scoped.rs:40:9
  34: tokio::runtime::context::set_scheduler::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context.rs:180:26
  35: std::thread::local::LocalKey<T>::try_with
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/thread/local.rs:283:12
  36: std::thread::local::LocalKey<T>::with
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/thread/local.rs:260:9
  37: tokio::runtime::context::set_scheduler
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context.rs:180:9
  38: tokio::runtime::scheduler::multi_thread::worker::run::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:508:9
  39: tokio::runtime::context::runtime::enter_runtime
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context/runtime.rs:65:16
  40: tokio::runtime::scheduler::multi_thread::worker::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:500:5
  41: tokio::runtime::scheduler::multi_thread::worker::Launch::launch::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/worker.rs:466:45
  42: <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/blocking/task.rs:42:21
  43: tokio::runtime::task::core::Core<T,S>::poll::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/core.rs:331:17
  44: tokio::loom::std::unsafe_cell::UnsafeCell<T>::with_mut
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/loom/std/unsafe_cell.rs:16:9
  45: tokio::runtime::task::core::Core<T,S>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/core.rs:320:13
  46: tokio::runtime::task::harness::poll_future::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:500:19
  47: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panic/unwind_safe.rs:272:9
  48: std::panicking::try::do_call
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:557:40
  49: ___rust_try
  50: std::panicking::try
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:521:19
  51: std::panic::catch_unwind
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panic.rs:350:14
  52: tokio::runtime::task::harness::poll_future
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:488:18
  53: tokio::runtime::task::harness::Harness<T,S>::poll_inner
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:209:27
  54: tokio::runtime::task::harness::Harness<T,S>::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/harness.rs:154:15
  55: tokio::runtime::task::raw::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/raw.rs:271:5
  56: tokio::runtime::task::raw::RawTask::poll
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/raw.rs:201:18
  57: tokio::runtime::task::UnownedTask<S>::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/task/mod.rs:473:9
  58: tokio::runtime::blocking::pool::Task::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/blocking/pool.rs:160:9
  59: tokio::runtime::blocking::pool::Inner::run
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/blocking/pool.rs:518:17
  60: tokio::runtime::blocking::pool::Spawner::spawn_thread::{{closure}}
             at /Users/bo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/blocking/pool.rs:476:13
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
unable to initialize bip300 handler: task 11 panicked with message "called `Result::unwrap()` on an `Err` value: UnsupportedSegwitFlag(0)"