Skill.json is not valid

[pjshumphreys]

If I run this command from the command line againg the skill.json in this project

ask api update-skill -s [my skill id] -f skill.json

I get this response:

Call update-skill error.
Error code: 400
{
"message": "Skill manifest is not valid.",
"violations": [
{
"message": "Invalid skill information."
}
]
}