Please edit security policy file.

 

The security policy file (default.config, admin.config and guest.config) can be found in the /CuteEditor/Configuration/Security folder. In security policy file you can find the ImageGalleryPath element which contains the image gallery path information within Cute Editor.  By default, it contains the following format:

<security name="ImageGalleryPath">~/uploads</security>

 

Just make sure the above folder does exist in your server.

 

BTW, which version of CuteEditor are you using?