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chinni dchinni d 

what are the common errors while developing code in Apex and Visualforce page and deployment?

pconpcon
Can you please expand upon what you are trying to accomplish with these questions.  If you are trying to study up for an exam or for an interview there are better ways to do this than to ask asinine questions on the board.  This question is so vague and open ended that there is no best answer and there is not even a good answer that would be useful in the real world.