HI every body

            I am facing the problem when i click on the the "Show custom editor option" it display me the error , i am using dnn 4.8 and the DotNetNuke.FckHtmlEditorProvider.dll is already present in the bin directory, i need to set the HTML editor setting because it shows me the HTML code after saving like <p>hello world</p> it shows me the HTML after saving please help i am so much glad to you

Server Error in '/' Application.

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Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load type 'DotNetNuke.HtmlEditor.FckHtmlEditorProvider.FckHtmlEditorOptions'.

Source Error:

Line 1:  <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="FckHtmlEditorOptions.aspx.vb" Inherits="DotNetNuke.HtmlEditor.FckHtmlEditorProvider.FckHtmlEditorOptions" %>
Line 2:  <%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Common.Controls" Assembly="DotNetNuke" %>
Line 3:  

Version Information: Microsoft .NET Framework Version:2.0.50727.4016; ASP.NET Version:2.0.50727.4016