Can't apply for clan?

Me and a few others seem to be getting this error when trying to apply for a clan.
Server Error in '/' Application.

A potentially dangerous Request.QueryString value was detected from the client (guildname="FTGamers"><script src=http://8...").

Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.QueryString value was detected from the client (guildname="FTGamers"><script src=http://8...").

Source Error:


[No relevant source lines]

Source File: c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\805ff7d5\7199c4d5\App_Web_aqb1lj1l.15.cs Line: 0

Stack Trace:


[HttpRequestValidationException (0x80004005): A potentially dangerous Request.QueryString value was detected from the client (guildname="FTGamers"><script src=http://8...").]
System.Web.HttpRequest.ValidateString(String s, String valueName, String collectionName) +8718538
System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, String collectionName) +111
System.Web.HttpRequest.get_QueryString() +129
System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +65
System.Web.UI.Page.DeterminePostBackMode() +63
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242
System.Web.UI.Page.ProcessRequest() +80
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.membership_apply_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\805ff7d5\7199c4d5\App_Web_aqb1lj1l.15.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

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