"Ajax Error!!! parsererror", when previewing a slide in Revolution Slider

Hello,
We're having an issue with the Revolution Slider bundled in the Betheme. The error is happening on https://jydsk-planteservice.dk.

When we click on Preview in Revolution slider, the error "Ajax Error!!! parsererror" pop up in the top right corner. The preview box then stays blank.

Installed Version of Revolution Slider: 6.0.7
Memory limit is set to 256 M
All plugins and themes updated to the latest version
Already tried deactivating the Wordfence plugin and page animations in Betheme, but this didn't fix the issue.

Thank you

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