I open a support ticket ID : 126379
I use RadEditor version 188.8.131.52__1f131a624888eeed.
I set the configuration as you suggested but the error still occurs. what should I do?
"My suggest is to set the StripAbsoluteAnchorPaths and StripAbsoluteImagesPaths properties to "true" in the Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\RadEditorSharePoint\4.x.x.x__xxxxxxxxxx\RadControls\Editor\ListConfigFile.xml file. Thus the editor's managers will insert the selected media, link and img files with relative paths and this can solve the problem."