Problem in InAppBilling in HTC Hero

I am working in an app that has inAppPurchasing. I had implement it, but yesterday it stopped, Now I can't able to open in app Page. I have not developer account. Is this the Problem or is it device problem, I m struggling with it for two days Please help me.

boolean bindResult = bindService(new Intent("com.android.vending.billing.MarketBillingService.BIND"), this, Context.BIND_AUTO_CREATE);
            if(bindResult){
                Log.i(TAG,"Market Billing Service Successfully Bound");
            } else {
                Log.e(TAG,"Market Billing Service could n开发者_开发百科ot be bound.");
                //TODO stop user continuing
            }

in console "Market Billing Service could not be bound" prints.

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This may be caused by the Android Market's old version. In-App Billing requires Market version 2.3.4 or higher, please check your device's Market version and update it if needed.