I get following error when I click on an accordion element:
comp.animate is not a function

I reconstruated that error with the accordion in the PR5-examples directory by replacing the first common panel with a tree panel.

PHP Code:
var item1 = new Ext.tree.TreePanel({
                
title'Accordion Item 1',
            });

            var 
item2 = new Ext.Panel({
                
title'Accordion Item 2',
                
html'<empty panel>',
                
cls:'empty'
            
});

            var 
item3 = new Ext.Panel({
                
title'Accordion Item 3',
                
html'<empty panel>',
                
cls:'empty'
            
});

            var 
item4 = new Ext.Panel({
                
title'Accordion Item 4',
                
html'<empty panel>',
                
cls:'empty'
            
});

            var 
item5 = new Ext.Panel({
                
title'Accordion Item 5',
                
html'<empty panel>',
                
cls:'empty'
            
});

            var 
accordion = new Ext.Panel({
                
region:'west',
                
margins:'5 0 5 5',
                
split:true,
                
width210,
                
layout:'accordion',
                
items: [item1item2item3item4item5]
            });

            var 
viewport = new Ext.Viewport({
                
layout:'border',
                
items:[
                    
accordion, {
                    
region:'center',
                    
margins:'5 5 5 0',
                    
cls:'empty',
                    
bodyStyle:'background:#f1f1f1',
                    
html:'<br/><br/>&lt;empty center panel&gt;'
                
}]
            });
        });