StackView has detected conflicting anchors

[123456789]

where is está o problema?
Informacion is reduce

import QtQuick 2.1
import QtQuick . Layouts 1.0
import QtQuick.Controls 1.0
import QtQuick.Layouts 1.0
import QtQuick.Dialogs 1.1

//QString nvl= ui->TextField->text();
ColumnLayout {
anchors.fill: parent
anchors.margins: 300
spacing: 3
property color mainAppcolor: "#6fda9c"

Label{
    text: "LOGIN"
    font.pointSize:70
    leftPadding: 90
    width: layout.implicitWidth
}

ComboBox {
    Layout.fillWidth: true
    model :[ "Nível 1                                      " ,
             "Nível 2                                      " ,
             "Nível 3                                      " ,
             "Nível 4                                      "  ]
}

TextField {
        id: password_field
        placeholderText: qsTr("Write your password")
        Layout.fillWidth: true
        echoMode: TextInput.Password
    }

Button {

// property var String: 0

   // id: proccessButton0
   Layout.fillWidth: true

   onClicked: {
       if(TextField.text=="123"){
       Label.text== "já ";
       }else
         Label.text== "já foste";
   }


        }

}

[mrjj]

Hi
But normally it says where with a
File and line number ?