discuz ucenter 写着not found 和头像是红色小叉

我用的是discuz 7.02 ，Ucenter 写住not found

The requested URL /Discuz/upload/uc_server/admin.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

我一查之下发觉 头像的红色小叉 是跟这个有关系,因为连接不正确,

so ,哪位大哥step by step 教导一下~谢谢

/Discuz/upload/uc_server/admin.php 这个文件不存在，你检查下，要是不存在的话，上传文件即可。