visualiser run error

[tmpbci]

On mac Sierra while trying :
RUST_BACKTRACE=1 cargo run --release --example dac_emulator_visualiser

Result is : Finished release [optimized] target(s) in 0.25s
Running target/release/examples/dac_emulator_visualiser
thread 'main' panicked at 'called Option::unwrap() on a None value', /Users/leduc/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.3/src/instance.rs:474:5
stack backtrace:
0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
1: core::fmt::write
2: std::io::Write::write_fmt
3: std::panicking::default_hook::{{closure}}
4: std::panicking::default_hook
5: std::panicking::rust_panic_with_hook
6: rust_begin_unwind
7: core::panicking::panic_fmt
8: core::panicking::panic
9: wgpu_request_adapter
10: wgpu::Adapter::request
11: nannou::wgpu::device_map::AdapterMap::get_or_request
12: nannou::window::Builder::build
13: dac_emulator_visualiser::model
14: nannou::app::Builder<M,E>::run
15: dac_emulator_visualiser::main
16: std::rt::lang_start::{{closure}}
17: std::rt::lang_start_internal
18: main
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.