Issues Launching cluster [ InvalidAMIID.NotFound ]

[lok63]

I followed all the instructions up to step 4 (http://ampcamp.berkeley.edu/3/exercises/launching-a-bdas-cluster-on-ec2.html) and i already have my key pair on my AWS console as instructed. First i ran this :

./spark-ec2 -i ampcamp.pem -k ampcamp --copy launch amplab-training
I got the following error: InvalidKeyPair.NotFound. Then i changed my region like this:

./spark-ec2 -i ampcamp.pem -k ampcamp -r us-west-2 --copy launch amplab-training
Now i have the following error: InvalidAMIID.NotFound

Any suggestions?