(stay online!!!)Webmail chinese language error

[x11313h]

Hello!Everyone!Now I have an urgent question:

I've configured the zentyal web mail,and when I choose the English language,it works normally,but when choosing other languages,for example Simplified Chinese,it warns me :

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /SOGo/so/xh/Mail/view.

Reason: Error reading from remote server

Apache/2.4.7 (Ubuntu) Server at 192.200.3.154 Port 443


So,how can I solve this problem???Please help !!!!!!Thanks!!!!!