It would be helpful if you gave us some more details about your problem with Guided Edits. Which GE generates this message? At which step of the GE does the message appear? Does this message appear in more than one GE?
If you’ve used the create frames button the placeholders should be ready to receive photos either from the photo bin or from a folder. Are you still in the Guided Edit mode or have you gone into Expert or Quick mode? See if my YouTube video helps – Multi Photo Text.