With AjaxControlToolkit 15.1 found a problem with HtmlEditorExtender.
If I insert one or more images in the text, the upload stops on 100% upload on the first image with this error " run-time error of JavaScript: Sys.ArgumentException: Impossible to deserialize an empty string"
Attached are the error message and the upload image box.
If I insert one or more images in the text, the upload stops on 100% upload on the first image with this error " run-time error of JavaScript: Sys.ArgumentException: Impossible to deserialize an empty string"
Attached are the error message and the upload image box.