jQuery Grid Plugin - jqGrid

HEllo,

My colname and colmodel :

 colNames:["RANG","modrgrel","les ID"],
  colModel : [
  {name:"rang", index:"rang", width:200,jsonmap:"fields.rang"},
  {name:"modeel", index:"modeel", width:200, sortable:true, jsonmap:"model"},
  {name:"id", index:"id", width:120, jsonmap:"pk"},
  ],

jsonreader:

  jsonReader: {
  root: "rows",
  id: "pk",
  cell: "fields",
  page: "page",
  total: "total",
  records: "records",
  repeatitems: false  
  },

json data:

{"total":1, "page":1, "records":2,

"rows":[

{"pk": 4, "model": "prechoix.monprofile", "fields": {"rang": 4}},

{"pk": 5, "model": "prechoix.monprofile", "fields": {"rang": 5}}

]}

"modee"l and "id" works well but "rang" doesn't show anything.

I read many things on tis forum about it but I can-t find my error.

thanks for help