I was getting the same error, I just updated the PHP version in WHM from 5.x to 7.1, and it quickly fixed the issue. Hopefully, it’ll work for you as well unless any other plugin/theme is not causing a conflict.
Perhaps, I’ll recommend, activating WordPress basic theme temporarily & updating the PHP version. It should tell you what yu’re looking for
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This reply was modified 4 years, 3 months ago by codetoons.