diff --git a/webapp/services/BlockChainService.php b/webapp/services/BlockChainService.php
index a442715a..5183a3ad 100644
--- a/webapp/services/BlockChainService.php
+++ b/webapp/services/BlockChainService.php
@@ -29,14 +29,14 @@ class BlockChainService {
         if (!($actionType > Transaction::BUY_BEGIN_ACTION_TYPE &&
               $actionType < Transaction::BUY_END_ACTION_TYPE)) {
             error_log('gameItemMallBuy action_type error:' . $actionType);
-            myself()->_rspErr(500,  'server internal error');
+            myself()->_rspErr(500,  'server internal error 1');
             die();
             return;
         }
         $account = myself()->_getAddress();
         if (empty($account)) {
             error_log('gameItemMallBuy address is  emtpy:' . myself()->_getAccountId());
-            myself()->_rspErr(500,  'server internal error');
+            myself()->_rspErr(500,  'server internal error 2');
             die();
             return;
         }
@@ -53,7 +53,7 @@ class BlockChainService {
                 ($url,
                  $params,
                  $response)) {
-                myself()->_rspErr(500,  'server internal error');
+                myself()->_rspErr(500,  'server internal error 3');
                 die();
                 return;
             }
@@ -76,7 +76,7 @@ class BlockChainService {
                     'params' => $rspObj['params']
                 );
             } else {
-                myself()->_rspErr(500,  'server internal error');
+                myself()->_rspErr(500,  'server internal error 4');
                 die();
                 return;
             }