I am getting an error message while provisioning aws EC2 instance as Load Generator in controller

I carefully followed all the instructions provided at this link http://community.hpe.com/t5/LoadRunner-and-Performance/Step-by-step-instructions-to-Provision-Load-Generators-in-the/ba-p/6434080#.Vm6P7fkrLIV to provision  load generators in AWS. I am getting the following error message

"Error while validating account credentials: element of RegionItemType is not regionNname"

Please help

Thank you