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why it gives me IllegalStateException when i click button on fragment

 
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I have app with viewpager.I need to call other fragment methon when i click button on first fragment.

this is my mail Activity




this is my fragment1



this is fragment2



this is myfragment_layout xml file




this is my_fragment2 xml filee




when i run the app it gives me the first fragment with a button.when i clcick button it gives me below error



The line which gives null pointer is below

 
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It seems like is null.
It's bit hard to make a guess.
If you can send source code, I hope I'll be able to help you to solve this problem.
please check your private messages for my email address.

-Supun
 
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