why genereat this error when i use filtered words in forum madule?

Error: Manage Filtered Words is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Could not load file or assembly 'MemberRole, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b7c773fb104e7562' or one of its dependencies. The system cannot find the file specified. ---> System.IO.FileNotFoundException: Could not load file or assembly 'MemberRole, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b7c773fb104e7562' or one of its dependencies. The system cannot find the file specified. File name: 'MemberRole, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b7c773fb104e7562' at DotNetNuke.Modules.Forum.BadWords.BindData(String SearchText) at DotNetNuke.Modules.Forum.BadWords.Page_Load(Object sender, EventArgs e) WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. --- End of inner exception stack trace ---