No suitable method found

here's my error:
Error 1 'ASP.admin_new_user2_aspx.GetTypeHashCode()': no suitable method found to override c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\teststatus2production\7e352623\d1efa770\App_Web_cx7fp0f_.18.cs 4443 
here's the code:

[System.Diagnostics.DebuggerNonUserCodeAttribute()]
        public override int GetTypeHashCode() {
            return 210248864;
        } 
...