Hi Olga,
When editing sliders in slider revolution getting this slide as like shown inthe image https://prnt.sc/x9k66p. Actually needed to change the url of each menu navigation given in the slides, when changing this url will always getting this error. This issue happens when initially loading the page.
What is to be noticed to avoid this issues while editing the slides to change the url in some hidden layers of the slides.
Thank You
Saira