Google in-app billing,Error retrieving information from server [DF-DFERH-01]

I'm testing google's in-app billing. I follow the instruction of google in-app billing training, using the IabHelper.

I setup the IabHelper successfully.

mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
        public void onIabSetupFinished(IabResult result) {
            Log.d("GooglePay", "Setup finished.");

            if (!result.isSuccess()) {
                // Oh no, there was a problem.
                Log.d("GooglePay", "Problem setting up in-app billing: " + result);
                return;
            }

            // Have we been disposed of in the meantime? If so, quit.
            if (mHelper == null) return;

            mBroadcastReceiver = new IabBroadcastReceiver(GooglePayPlugin.this);
            IntentFilter broadcastFilter = new IntentFilter(IabBroadcastReceiver.ACTION);
            mActivity.registerReceiver(mBroadcastReceiver, broadcastFilter);
        }
    });

Then, I call the purchase API of IabHelper.

try {
     mHelper.launchPurchaseFlow(mActivity, productID, RC_REQUEST,
                mPurchaseFinishedListener, payload);
} catch (IabAsyncInProgressException e) {
     Log.d("GooglePay", "Error launching purchase flow. Another async operation in progress.");
}

But, I always got a popup windows says: "从服务器检索信息时出错。[DF-DFERH-01]", as the following picture.

The logcat information is in attated.

I solved this issue eventually, put my answer here, hope it help those who met the same problem like me.

mHelper.launchPurchaseFlow(mActivity, productID, RC_REQUEST, mPurchaseFinishedListener, payload);

The "payLoad" parameter is too long, I set the payload to empty string, then the problem is sloved, no more df-dferh-01.

It's nothing to do with the VPN, nothing to do with the google library, just because the payload is too long for google play service interface.