Server Error in '/' Application.

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Line 307:                        app.Context.RewritePath(url + eShop.App_Code.K.ioPage, "", query);
Line 308:                    }
Line 309:                    else if (System.IO.File.Exists(this.Server.MapPath(app.Request.ApplicationPath + "/" + akce + ".aspx")))
Line 310:                    {
Line 311:                        app.Context.RewritePath(url + akce + ".aspx", "", query);

[ArgumentException: Illegal characters in path.]
   System.IO.Path.CheckInvalidPathChars(String path) +126
   System.Security.Permissions.FileIOPermission.HasIllegalCharacters(String[] str) +54
   System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList) +73
   System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path) +63
   System.Web.InternalSecurityPermissions.PathDiscovery(String path) +29
   System.Web.HttpRequest.MapPath(VirtualPath virtualPath, VirtualPath baseVirtualDir, Boolean allowCrossAppMapping) +146
   System.Web.HttpRequest.MapPath(VirtualPath virtualPath) +37
   System.Web.HttpServerUtility.MapPath(String path) +99
   ASP.global_asax.Application_BeginRequest(Object source, EventArgs e) in c:\www\www.smlouva-smlouvy.cz\Global.asax:309
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75