I have an error when upload images?DisallowUnsafeCharacters? pls, help me!

The error follow: i don't know how to fix?

It was not possible to properly load the XML response from the web server.

Raw response from the server:

 

Server Error in '/' Application.

Compilation Error

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

Compiler Error Message: CS0103: The name 'DisallowUnsafeCharacters' does not exist in the current context

Source Error:
 

Line 83: 		// If enabled, CKFinder will disallow creating folders and uploading files whose names contain characters
Line 84: 		// that are not safe under an IIS 6.0 web server.
Line 85: 		DisallowUnsafeCharacters = true;
Line 86: 		
Line 87: 		// If CheckDoubleExtension is enabled, each part of the file name after a dot is

Source File: c:\inetpub\vhosts\hi-chef.vn\httpdocs\ckfinder\config.ascx    Line: 85

 

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Version Information: Microsoft .NET Framework Version:2.0.50727.3649; ASP.NET Version:2.0.50727.3634