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If you are using the image widget then this doesn't apply but if you are using HTML to place images the common problems are file names and paths to the image in your File Manager. These need to be correct character for character, including the case.
If you are using widgets and see this error then I would check the filenames to make sure there are no illegal characters in the File names. No ()!@#$%^&*+ characters are allowed for some image widgets, so it's best to stick to familiar Roman alpha-numeric characters only.
Finally there can be a lag between placing the image into the File Manager and the processing of this ready to display. In such cases it's worthwhile checking again after some period of time. This has been as long as 20 minutes in the past but I have seen it recently at about 5 minutes delay. yolasite subdomains are more affected by this delay than custom domains.