[Help Wordpress] Uncaught TypeError: Object [object Object] has no method 'royalSlider'

Uncaught TypeError: Object [object Object] has no method 'royalSlider'

Hello,

I get this error message : Uncaught TypeError: Object [object Object] has no method 'royalSlider'
In my plugin backend, the slider's preview is correct.
What is the answer of this issue ?

Thx

Maxdral

.

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