The KMS grant CLI commands in the video appear to be wrong

I’m not sure what version of the CLI the presenter is using, but it appears to not work for the version I have installed.  

$ aws kms encrypt –plaintext "hello" –key-id arn:aws:kms:us-west-2:831075265234:key/62fe7757-0baa-4c6b-9fc2-778bafd1a176

Invalid base64: "hello"

$ aws –version
aws-cli/2.0.0 Python/3.7.4 Darwin/18.7.0 botocore/2.0.0dev4