Using flex and apex for my app developement. When tried to update an custom object getting the following error. Below displayed my code snippets. can any one help me.

 
          [0] (com.salesforce.results::Error)#5
            fields = "Name"
            message = "Unable to create/update fields: Name. Please check the security settings of this field and verify that it is read/write for your profile."
            statusCode = "INVALID_FIELD_FOR_INSERT_UPDATE"
            StatusCode = 0
        uid = "4DEF471D-F08C-791A-FE1A-9928F5BF03A4"

var a:Array = [];
for( var i:int = 0; i < updateList.length; i++ )
{
var tempVO:DataVO = dmeModel.acExpensesToAssign.getItemAt(i) as DataVO;

var o:Object = tempVO.toObject();
var so:SObject = new SObject(o);
a.push( so );
}
apex.update(a,new AsyncResponder(handleSaveAllResult,handleFault) );

public function toObject():Object
{
var o:Object = {};

o.ExpenseName__c = this.Name;
o.UserName__c = this.UserName;

if(this.Id) o.Id = this.Id;
if(this.ExpenseId)o.Name = this.ExpenseId;

o.Amount__c = this.Amount;

if( this.Incurred )
o.IncurredDate__c = Util.dateToString(this.Incurred);
if( this.Submitted )
o.SubmittedDate__c = Util.dateToString(this.Submitted);

o.ExpenseReport__c = this.ExpenseReport;
o.Project__c = this.Project;
o.Type__c = this.ExpenseType;
o.Category__c = this.Category;
o.type = this.type;

return o;
}

Thanks

dme