in the last blocks my wallet was corrupt do not know why .. but i read  transaction in conflict or something like this so i dont know what happen  ..  for solve i just delete all blockchain so the client start dowland from start ,and i put the corrupt wallet in the folder of bit core and magically it open without errors with 0 credit , but in wallet.dat are recorded all transiction so i just got from debug all privatekeys and i imported to blockchain .. now i think it work good again .. but i dont know what was the problem .. but i was sure the wallet was the problem because with fresh wallet the problem disappear .