Receive the Following message "Non-existent changeset UUID."

When I went to change a featured slider after my site went live on the multi-site network, I could no longer change it. I went to Appearance-> Customize-> Featured Slider and the only thing I can select is "Enable Slider on" with the dropdown menu of Homepage/Frontpage; Entire site; or Disabled. Currently Homepage/Frontpage is selected. In the view window, the following shows up: "Non-existent changeset UUID." This is also happening to Featured Content. The website is ctfog.org