I'm getting this error:

```
 ❯ cargo embed --features v2 --target thumbv7em-none-eabihf
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
      Config default
      Target /var/home/sashin/ドキュメント/projects/rust-microbit/discovery-master/microbit/target/thumbv7em-none-eabihf/debug/led-roulette
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0001000: CIDR0 has invalid preamble (expected 0xd, got 0x0)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0001000: CIDR2 has invalid preamble (expected 0x5, got 0x0)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0001000: CIDR3 has invalid preamble (expected 0xb1, got 0x0)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0000000: CIDR0 has invalid preamble (expected 0xd, got 0xb1)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0000000: CIDR1 has invalid preamble (expected 0x0, got 0x1)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0000000: CIDR2 has invalid preamble (expected 0x5, got 0xb1)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0040000: CIDR0 has invalid preamble (expected 0xd, got 0x0)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0040000: CIDR2 has invalid preamble (expected 0x5, got 0x0)
        WARN probe_rs::architecture::arm::memory::romtable > Component at 0xe0040000: CIDR3 has invalid preamble (expected 0xb1, got 0x0)
       Error failed attaching to target
             
             Caused by:
                 0: Unable to load specification for chip
                 1: The connected chip could not automatically be determined.

```