Sencha list paging plugin doesn´t work properly

Question

I am trying to implement a feature with the "ListPaging" Sencha plugin, and its working correctly but with the next case I am having an exception. Server sents the total count of rows, for example 10, but if I have the pagesize property configurated with 11 rows, plugin doesn´t work. Here a little piece of code with the store implementation:

store = Ext.create('Cicero.store.activity.Activities', {
            storeId: storeId,
            pageSize: 10,
            autoLoad: false,
            clearOnPageLoad: false
        });

This is the plugin implementation in the view:

            //LISTPAGING
        {
            xclass: 'Ext.plugin.ListPaging',
            autoPaging: true,
            loadMoreText : 'Loading more activities',
            noMoreRecordsText : 'All Activities loaded'
        }
    ],
    scrollable: true,
    onItemDisclosure: true,
    emptyText: 'No activities found',

Mainly the problem is: All is working correct but when the number of records returned is less than the page size, the plugin doesn´t work..

Any clue?