Program crashes when run

[Policepigeon]

I have checked ec_sys is present and running, but whenever I run the bin, it says

String in morse: ... _ ._. .. _. __.
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 22, kind: InvalidInput, message: "Invalid argument" }', src/libcore/result.rs:1188:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.