Error in Qlistmodel standard item

[maarvi]

hello every one i want to make list in Qt having 3 column i have made code but its not working kindly have a look at it

QStandardItemModel *listmodel = new  QStandardItemModel(this);
    QStandardItem * root = listmodel->invisibleRootItem();
    QStandardItem *item = new QStandardItem("col1" ,"col2" ,"col3");
    root->appendRow(item);

QStandardItemModel *listmodel = new  QStandardItemModel(this);
    QStandardItem * root = listmodel->invisibleRootItem();
    QStandardItem *item = new QStandardItem("col1" ,"col2" ,"col3");
    root->appendRow(item);

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i am getting an error at 3rd line kindly tell me how to add columns in list box