[INFO] crate actix-mqtt-client 0.4.2 is already in cache
[ERROR] this task or one of its parent failed!
[ERROR] unable to download actix-mqtt-client version 0.4.2
[ERROR] caused by: failed to unpack `actix-mqtt-client-0.4.2/.travis.yml` into `/workspace/builds/worker-6/source/.travis.yml`
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.