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This isn't the answer to your query.. but in this thread you say.. "went to nokia care..they re-installed it's software" ..and in this thread (difference in the 2 posts just about 23 minutes) you say "No..i will do it by go to nokia care" (to re-install the Firmware) ...
..so whats the real thing ?
Make sure that all the songs are in the right format. You can check what formats X2-01 supports from here, and then Multimedia > Audio formats.
Back up the songs somewhere, e.g. PC. Try to format the memory card: Menu > Applications > Gallery > Long press "memory card" > Mem. card opt. > Format m. card. Then transfer the songs back to the card.
If still not working, try with another memory card if possible. Or try the card with another phone, to see if the memory card is faulty.
Hope you get it to work!