mage error: AWS Region: "Sorry, your reply was invalid: Value is required"

[bcdady]

Defect Description When building sshrimp with mage, user is prompted first to provide an AWS Account ID (12 digit number), and then select an AWS Region from a list, using arrow keys and the Enter key. During this second step, after moving the 'carat' cursor to an AWS Region in the list and typing the Enter key, the following message is returned (in red text), and the user is unable to proceed.

X Sorry, your reply was invalid: Value is required

Repro steps

1. Follow instructions under Quickstart
2. • [X] Installed mage

▶ mage --version
Mage Build Tool v1.10.0-2-g50f568e
Build Date: 2020-11-04T16:16:07-07:00
Commit: 50f568e
built with: go1.15.3

2. • [ ] run mage

▶ mage
? AWS Account ID: 000000000000
X Sorry, your reply was invalid: Value is required
? AWS Region:  [Use arrows to move, enter to select, type to filter, ? for more help]
> [ ]  ap-east-1
  [ ]  ap-northeast-1
  [ ]  ap-northeast-2
  [ ]  ap-south-1
  [ ]  ap-southeast-1
  [ ]  ap-southeast-2
  [ ]  ca-central-1
  [ ]  eu-central-1
  [ ]  eu-north-1
  [ ]  eu-west-1