This was previously reported here. https://forums.openlp.org/discussion/5840/images-dont-load-in-saved-service-missing-display-handler
Sorry for the duplication.
When an image is placed in a service, one of two things happens after the service is saved and reopened:
1) The service file gets corrupted and will not open any service item from the image down (if the image is a GIF). All service items above the image will appear as normal even though this error pops up.
2) The following error appears when trying to display the image (if the image is a JPG or PNG).