(42,33): error CS0103: The name `Network' does not exist in the current context

Assets/Script/Server/Server.cs(42,33): error CS0103: The name `Network’ does not exist in the current context

How I can fix it ? Im trying to export it in flash.

Your answer is here: http://docs.unity3d.com/Documentation/Manual/flash-whatssupported.html

Unity default networking (Raknet) is not supported in Flash.