Problem with National GunZ 1.5

i have change patch.xml with ZPatchBuilder , but not working

Code:

Log start : Tue Jun 25 22:58:16 2013 Current Directory : C:\Users\abc\Desktop\National Gunz 22:58:16:737 [APP] OS version : Professional (Build 9200) 22:58:16:771 [APP] Window created successfully. 22:58:18:956 [ZUpdate] Create. 22:58:18:956 [ZFileTransfer] Create. 22:58:18:956 [ZFileTransfer] Create successfully complete. 22:58:18:957 [ZFileTransfer] Open connection. 22:58:18:957 [ZFileTransfer] Open connection successfully complete. 22:58:18:957 [ZFileTransfer] Change directory. 22:58:18:957 [ZFileTransfer] Change directory successfully complete. 22:58:18:958 [ZUpdate] Create successfully compete. 22:58:18:958 [APP] Download patch info file 22:58:18:959 [ZUpdate] Start update. 22:58:18:960 [ZFileTransfer] Download file : ./patch.xml to ./patch.xml 22:58:18:964 [ZFileTransfer] ERROR : The server name or address could not be resolved 22:58:18:964 [ZUpdate] ERROR : Start update FAILED!!! 22:58:18:964 [APP] ERROR - Cannot download patch info file 22:58:18:965 [APP] Updater error message : The update server is not responding or is not running right now. [Tip] Please check your firewall. [Tip] Please try again after a while. 22:58:18:965 [App] File transfer error message : The server name or address could not be resolved