My application is here.

It does not have any error in Ext Designer, even when loading data, but the following message is occurred if it is uploaded to the web server.

Uncaught TypeError: Cannot call method 'on' of undefined

The changes are only a store type and a store name after stable running.

When I went into the source code, I found the undefined value is a store variable.

In the grid view control, it occurs when setting event handler which is a kind of "on load data".

Thanks in advance.