How to Integrate Java API in ExtJs

Hi anton,
I am new in ExtJs I am trying to integrate java API to save record in extJs but it gives error. i.e. Ext.form.Basic.updateRecord(): A record is required.

Please elaborate

It does not fetch the data from form. Here is my code. getting problem to function updateRecord(). It shows a record is required.

 onSaveClick: function (button) {
        var dialog, record, store;
        dialog = button.up('window').down('form');
        dialog.updateRecord();
        record = dialog.getRecord();
        
        if (record === Traccar.app.getUser()) {
            record.save();
        } else {
            store = Ext.getStore('Routes');
            if (record.phantom) {
                store.add(record);
            }
            store.sync({
                failure: function (batch) {
                    store.rejectChanges();
                    Traccar.app.showError(batch.exceptions[0].getError().response);
                }
            });
        }
        button.up('window').close();      
    }