In dnn 3.2.1 I receive the following error when trying to edit the html/text module, it has suddenly happened it worked yesterday, what can I do?
web.config is correct as alt 1 below.

FreeTextBox has not been correctly installed. To install FreeTextBox either:
(1) add a reference to FtbWebResource.axd in web.config:
<system.web>
<httpHandlers>
<add verb="GET"
path="FtbWebResource.axd"
type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox" />
</httpHandlers>
</system.web>

(2) Save the FreeTextBox image and javascript files to a location on your website and set up FreeTextBox as follows
<FTB:FreeTextBox id="FreeTextBox1" SupportFolder="ftbfileslocation" JavaScriptLocation="ExternalFile" ButtonImagesLocation="ExternalFile" ToolbarImagesLocation="ExternalFile" ButtonImagesLocation="ExternalFile" runat="server" />

System.ArgumentOutOfRangeException: Length cannot be less than zero. Parameter name: length at System.String.Substring(Int32 startIndex, Int32 length) at DotNetNuke.HtmlEditor.Ftb3HtmlEditorProvider.ParseStyleSheet(String strCssFile) at DotNetNuke.HtmlEditor.Ftb3HtmlEditorProvider.AddStylesMenu() at DotNetNuke.HtmlEditor.Ftb3HtmlEditorProvider.AddStyleToolBar() at DotNetNuke.HtmlEditor.Ftb3HtmlEditorProvider.Initialize() at DotNetNuke.UI.UserControls.TextEditor.Page_Init(Object sender, EventArgs e) at System.Web.UI.Control.OnInit(EventArgs e) at System.Web.UI.UserControl.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Skins.Skin.InjectModule(Control objPane, ModuleInfo objModule, PortalSettings PortalSettings) --- End of inner exception stack trace ---

regards
sten