Server Error in '/' Application.

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[OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.]
   System.Text.RegularExpressions.RegexParser.PushOptions() +17
   System.Text.RegularExpressions.RegexParser.ScanRegex() +772
   System.Text.RegularExpressions.RegexParser.Parse(String re, RegexOptions op) +225
   System.Text.RegularExpressions.Regex..ctor(String pattern, RegexOptions options, Boolean useCache) +406
   System.Text.RegularExpressions.Regex..ctor(String pattern, RegexOptions options) +11
   System.Web.Configuration.RegexWorker.ProcessRegex(String target, String regexExpression) +58
   System.Web.Configuration.BrowserCapabilitiesFactory.OperaProcess(NameValueCollection headers, HttpBrowserCapabilities browserCaps) +86
   System.Web.Configuration.BrowserCapabilitiesFactory.DefaultProcess(NameValueCollection headers, HttpBrowserCapabilities browserCaps) +2905423
   System.Web.Configuration.BrowserCapabilitiesFactory.ConfigureBrowserCapabilities(NameValueCollection headers, HttpBrowserCapabilities browserCaps) +20
   System.Web.Configuration.BrowserCapabilitiesFactoryBase.GetHttpBrowserCapabilities(HttpRequest request) +159
   System.Web.Configuration.HttpCapabilitiesEvaluator.EvaluateFinal(HttpRequest request, Boolean onlyEvaluateUserAgent) +23
   System.Web.Configuration.HttpCapabilitiesEvaluator.Evaluate(HttpRequest request) +182
   System.Web.Configuration.HttpCapabilitiesBase.GetBrowserCapabilities(HttpRequest request) +162
   System.Web.HttpRequest.get_Browser() +197
   MagicAjax.MagicAjaxContext..ctor() +129
   MagicAjax.MagicAjaxModule.Application_BeginRequest(Object sender, EventArgs e) +528
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64