missing `verify` structure

[sagycohen]

Hi,
I get the following error message from Mozilla Backpack after accepting a test badge I issued: 'missing verify structure'.
Here is the badge link: http://sdml.ua.edu/awards/531333660893142/

This is what I get at the Metadata Validator website:
{
"status": "invalid",
"reason": "parse",
"error": {
"message": "parse",
"code": "parse",
"url": "http://sdml.ua.edu/awards/531333660893142/",
"reason": {},
"name": "ResourceError",
"field": "assertion"
}
}

Please advise,
Sagy