Server Error in '/Monitor' Application. DarkRP server error.

[District13DRP]

Here are the Logs,

Server Error in '/Monitor' Application.

Method not found: 'Void System.Web.UI.HtmlControls.HtmlForm.set_Action(Sys tem.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: 'Void System.Web.UI.HtmlControls.HtmlForm.set_Action(Sys tem.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: 'Void System.Web.UI.HtmlControls.HtmlForm.set_Action(Sys tem.String)'.]
• Monitor.Web.Base.Upload.Page_Load(Object sender, EventArgs e) +0
• System.Web.UI.Control.OnLoad(EventArgs e) +112
• System.Web.UI.Control.LoadRecursive() +74
• System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2497

We need help and nothing is Answering our Question, We tried to hit Upload so we could put the files in there, and we got THAT please Help!
Our Launch is very soon and nothing is answering our question, PLEASE HELP we really need someone that owns a DarkRP server to help!

district13darkrp.yolasite.com <----- Our Website

[url]www.TempestHost.com[/url] <----- Our Host

Please Help!

[editline]15th December 2013[/editline]

Answer: Reinstall server, contact host if errors continue.

If this doesn't work we still need help so please help!

-D13DRP