Error generating cryptographic key [Deploying AppScale via AppsCake]

[pandata]

Hi, I'm a new user of Appscale,
First, i created appscale1.6.6 box on VirtualBox
Then , i installed Appscake using the Apscake/README.txt and the youtube video to do it.
When i tried deploying via web interface, i shose virtualized cluster Xen/KVM, i have:

Cloud Deployment Log:
AppScale key 'appscale' not found on the disk. Generating...
[ERROR] Runtime error in deployment process: You do not have the 'expect' command in your PATH. Please ensure that it is in your path and try again.

How can i fix this please.
Thanks.
Asma.

[nlake44]

You do not have the 'expect' command in your PATH. Please ensure that it is in your path and try again.
Expect is a program which you need to install for the tools to run. Log into the box which has AppsCake on it and run:
apt-get install -y expect

We'll add this into the tools build to fix it.