Compilation error

I am using asp.net 4 and working in webmatrix.

I am getting the following error in an issue folder

Public partial class Issues: systemWeb Session. UI.page{

Line 12: namespace EP.BumplesMagazine.UI { Line 13: Line 14:     public partial class Issues : System.Web.UI.Page { Line 15:         protected void Page_Load(object sender, EventArgs e) { Line 16:

I have no idea where to look to solve this error. 

thanks, Jen