thread 'main' panicked...

I have an ubuntu v18.04 64-bit setup.
Installed rust and got the habitctl binary.
But when I try to run it, I get the following error message:
_**thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }', src/libcore/result.rs:1165:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.**_
 
