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NullPonterException

 
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I got the following NPE for the first time I log in to my application. after the first time, it is working fine
and when I refresh the error page, it is also working fine.
Can someone please point me out why is it happening and where did I make it wrong?

Thanks in advance.

 
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Without seeing your code, we are pretty much in the dark.
 
tyte kyat
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sorry, too much desire make me blind...

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