// Works:
  Error {
    id: error
    anchors.top: parent.top
    width: parent.width
    errorModel: sendErrorModel
  }
  Connections {
    target: error.errorModel
    onDataChanged: {
      error.height = (error.errorModel.rowCount() * 20)
    }
  }
// Doesn't work:
  Error {
    id: error
    anchors.top: parent.top
    width: parent.width
    errorModel: sendErrorModel
    Connections {
      target: errorModel
      onDataChanged: {
        height = (errorModel.rowCount() * 20)
      }
    }
  }