bnmiros,
Please check the ImageGalleryPath property. Make sure the URL path of the Image Gallery exists.
For example:
'Specifies the URL path of the Image Gallery. default "Uploads"
editor.ImageGalleryPath = "/Uploads"
'Specifies the URL path of the Flash Gallery. default "Uploads"
'editor.FlashPath= "/uploads"
'Specifies the URL path of the Downloadable Files. default "Uploads"
'editor.DocumentPath= "/uploads"
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