my clan error

when i click on my clan button this error comes up
Server Error in '/' Application.

---

Method not found: 'System.Data.DataRow NewClan.Core.Player_CF.get_player_info_mirror(System.String)'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.MissingMethodException: Method not found: 'System.Data.DataRow NewClan.Core.Player_CF.get_player_info_mirror(System.String)'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[MissingMethodException: Method not found: 'System.Data.DataRow NewClan.Core.Player_CF.get_player_info_mirror(System.String)'.]
NewClan.clanstat_cf.show_self(String usn) +0
NewClan.clanstat_cf.bind_lieutenantdata() +816
NewClan.clanstat_cf.Page_Load(Object sender, EventArgs e) +7226
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

---

Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053
any ideas of how to fix this ? pm me or reply to this post plz asap