Thanks Andy for your help.
I ran the program as you tell me and works! This means the libraries are installed, but why the program didn't compile? I show the code I'm, using //Code for hello-winforms.cs //this file is in /home/proyectos-mono using System; using System.Windows.Forms; public class HelloWorld : Form { static public void Main () { Application.Run (new HelloWorld ()); } public HelloWorld () { Text = "Hello Mono World"; } } Need I to specify the path of libraries? Thanks for the help José Eloy -- View this message in context: http://www.nabble.com/I-get-error-compiling-in-ubuntu-tp20786571p20921951.html Sent from the Mono - WinForms mailing list archive at Nabble.com. _______________________________________________ Mono-winforms-list maillist - Mono-winforms-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-winforms-list