错误：找不到适合的构造函数

Java编译器告诉您不能构造

Packet2ClientProtocol

具体来说，编译器发现了两个构造函数：

Packet2ClientProtocol.Packet2ClientProtocol(int,String,int)Packet2ClientProtocol.Packet2ClientProtocol()

但您致电给：

new Packet2ClientProtocol(51, GuiConnecting.func_74254_c(this.connectingGui), this.Username, this.ip, this.port)

都不匹配。