Error trying to create my first AWS Data Pipeline (Unable to construct an endpoint for ec2 in region None Error????)

I'm trying to create my first data pipeline using the console and the CLI template. But, the job fails with the error:

Unable to construct an endpoint for ec2 in region None

I'm not sure where to set the region. I have it in the myAWSCLICmd parameter but am not sure whether the region is for the EC2 that I'm trying to spin up or the EC2 that is running the spinup command. If the latter, I see no place to set it.

Can someone identify what needs to be set and where?