kubectl exec into container of a multi container pod

Question

I have problem login into one container of a multi-container pod. I get the container id from the kubectl describe pod <pod-name>

kubectl describe pod ipengine-net-benchmark-488656591-gjrpc -c <container id> 

When i try:

kubectl exec -ti ipengine-net-benchmark-488656591-gjrpc -c 70761432854f /bin/bash

It says: Error from server: container 70761432854f is not valid for pod ipengine-net-benchmark-488656591-gjrpc