Error on running aws-start from aws-alias.sh

Hey everyone,

I’m trying to start an AWS p2.xlarge instance using aws-start from aws-alias.sh and I get the following error:

xpm-mac-mini:AWS-setup apple$ source aws-alias.sh
xpm-mac-mini:AWS-setup apple$ aws-get-p2
i-0f11aca08cd60b99d
xpm-mac-mini:AWS-setup apple$ aws-start
STARTINGINSTANCES	i-0f11aca08cd60b99d
CURRENTSTATE	0	pending
PREVIOUSSTATE	80	stopped
usage: aws [options] <command> <subcommand> [parameters]
aws: error: argument operation: Invalid choice, valid choices are:

accept-vpc-peering-connection            | allocate-address                        
assign-private-ip-addresses              | associate-address
----------------------------------

and the list of choices goes on.
Despite the error, I can see from the AWS console that the instance is up and running. Any clue on what is causing the error? Thanks!