If you're using Hotel Master theme, please read this : https://goodlayers.ticksy.com/article/12190/ 

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How To Update GoodLayers Plugins? (since Flawless Theme)

First of all, please note that you can't use this method with Layer Slider, Revolution Slider and Master Slider.

1.) Go to 'Appearance > plugin', deactivate Goodlayers plugins and delete them. :

2.) After you delete them, you'll see this message :

Click on 'Begins installing plugins'

3.) Install them and don't forget to activate too! :