Extjs error: "me.events is undefined" when you fire event to an object

>> make sure that you ahve done addEvents("yourEvent")  for your object

Extjs error: while setting tree/rendering tree nodes error: record undefined

while setting tree/rendering tree nodes error: record undefined
>>Make sure objects you used as tree nodes do not have duplicate id,

"me.events is undefined" when you file event to an object
>> make sure that you ahve done addEvents("yourEvent")  for your object

EXTJS Error : strange error in border.js

make sure you imported 'Ext.layout.container.Border'

EXTJS Error : me.dockedItems is undefined:

one main reason is that, in your init function you did not called "callParent()".
"callParent()" should be called usually at the end of your init function