Vagrant Meta Data is Corrupt - vagrant

Question

Hope someone can help out here. I'm trying to version self hosted vagrant boxes, so doing this without using Vagrant Cloud.
I've created the following meta data file:
{
"description": "How about this",
"name": "Graphite",
"versions": [
{
"version": "1.8",
"providers": [
{
"name": "virtualbox",
"url": "http://desktopenvironments/Graphite/Graphite_1.8.box"
}
]
}
]
}
This is taken directly from the vagrant (somewhat lacking) documentation found at: http://docs.vagrantup.com/v2/boxes/format.html.
When running a vagrant add (taking the box file that contains this file directly from disk) I get:
The metadata associated with the box 'graphite' appears corrupted.
This is most often caused by a disk issue or system crash. Please
remove the box, re-add it, and try again.
Any assistance as to why this is happening would be greatly appreciated.

Answer 1

Was generating my metadata file from a c# app I wrote, using UTF8 for text encoding. This is not enough. You need to use UTF8 without BOM.
Once the Byte Order Mark was removed it all works 100s.
var settings = new JsonSerializerSettings() { ContractResolver = new LowercaseContractResolver() };
string json = JsonConvert.SerializeObject(metadata, Formatting.None, settings);
var utf8WithoutBom = new System.Text.UTF8Encoding(false);
using (var sink = new StreamWriter(outputFilePath, false, utf8WithoutBom))
{
sink.Write(json);
}