Hi, allow me to butt in here, just in case this info helps you or others.
The same thing was happening to me, and it was a nightmare importing a slider from my staging site. Ending up having to recreate it from scratch. However when I got to the navigation buttons it again started throwing an error and wouldn’t do it.
After some googling I finally realised it may be Wordfence causing it! If you have Wordfence installed then it could be causing your issue too. If so, put it into Learning Mode for a while as you create your slider, and then back to normal. It should have learned to play nice then.
Apologies if you don’t have Wordfence, I’ll leave the plugin developer to figure it out for you in that case. ??
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This reply was modified 1 year, 9 months ago by Shaolin.
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This reply was modified 1 year, 9 months ago by Shaolin.