help: bash error in emacs rust/cargo

Question

i get this error in emacs when runing a rust file (have rust and cargo):

cargo run 
/bin/bash: cargo: command not found

Compilation exited abnormally with code 127 at Thu Aug  8 20:28:50 

yet i have cargo :

cargo --version 
cargo 1.36.0 (c4fcfb725 2019-05-15) 

type -a cargo 
cargo is /var/root/.cargo/bin/cargo