Problem when trying to parse simple Json

[JFF-Bohdan]

When I trying to simple Json I go message "Error: syntax error, unexpected invalid. Line 4" (Qt 5.1.1, Mingw, Win 7 x64)

Json:

{
"fields" : [
{
"index" : 2,
"name" : "category_weight",
"type" : 2
},
{
"index" : 0,
"name" : "category_id",
"type" : 2
},
{
"index" : 1,
"name" : "category_name",
"type" : 10
}
]
}