WPBakery doesn't work - no backend or frontend

I purchased the Theme HTmagazine today, but the WPbakery doesn’t work.
There is no button in the backend and only the icon is displayed in the frontend.
I have enabled the backend and frontend editor in the general settings in the role manager.
My current Wordpress version is 5.1.4

Extract from the page:
vc_row css=".vc_custom_1456349460675{margin-bottom: 40px !important;}"][vc_column][slideshow layout=“grid” display=“posts” anim_effect=“fadeOut” autoplay=“yes” review_score=“yes” caption_length=“100” posts=“83,108,63,45,8,116”][/vc_column][/vc_row][vc_row][vc_column width=“2/3” …

please help me asap and thanks in advance.


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