I'd like to ask something , there's been long since i had my peerplays in ledger account and now i see that my balance is 0 . Can someone guide me what has happened ?
I can only assume you mean the testnet announcement from last year. We launched it for a limited time to allow those that held Peerplays tokens to be able to check how much was available in the sharedrop with Bitshares. Since then though we had to reload the genesis and didn't include those tokens in further testing.
It was only for testing purposes to allow people to check what their balances might be close to when the Peerplays Blockchain launches.
If however this is your account in Bitshares where your balance is zero. Either you had your Peerplays on the market and they sold, or your account was hacked somehow.