controller error container Sencha - extjs

Question

I am developing an app with sencha cmd and time of implementing a dataview shows me error and will not let me finish or show me what I should like to show.
I'm desperate for the error, is :
Uncaught Error: [ERROR][Ext.Container#onFirstItemAdd] Adding a card to a tab container without specifying any tab configuration
As much as I searched I have not found the solution, and not understand why I get this error, do not try to make a tab panel, simply a dataview with two fields json, one name and an image below
You help me please to see the error? Thanks
The code from my dataview:
Ext.define('catalg.view.VistaRuta', {
extend: 'Ext.Container',
alias: 'widget.fit',
xtype:'rta',
autoScroll: true,
config: {
items: [
{
xtype: 'dataview',
height: '100%',
styleHtmlContent: true,
width: '100%',
title: 'rta',
layout: {
type: 'fit'
},
inline: {
wrap: true
},
itemCls: 'dataview-item',
itemTpl: [
'<div class="arHeadline">',
' {titulo}',
'</div>',
'<div class="arbyline">',
' <img src="{foto}" />',
'</div>',
],
store: 'rtaStore'
},
{
xtype: 'toolbar',
docked: 'top',
title: 'look 10 rta',
autoScroll: true,
}
]
}
});

Answer 1

A Container may not contain any docked elements, only a Panel can contain docked elements:
Ext.Component: a simple html component (most visibly Ext object inherit from this)
Ext.Container: a component that can contain other components
Ext.Panel: a container that has a header and can contain docked components
most likely you will use a panel with some containers or other components in it
there is also a shortcut for setting docked components: tbar (=top bar) and bbar (=bottom bar)
why do you define an alias and an xtype? you should only use one of them (and the alias fit could easily create a name collision):
if you define a custom component you give it a name in a namespace catalg.view.VistaRuta which is all you need to create this component: Ext.create('catalg.view.VistaRuta')
cause this so long you can define aliases like alias: 'widget.rta' or xtype:'rta' so you can crate this component by using xtype:'rta'
I prefer using the alias cause there are other things like proxy., plugin. or feature. you can create aliases for, xtype is only for components
always choose only one method alias OR xtype so there is no conflict