I have had the same error with the same template. I deactivated Wordfence on this site and the same error continued to appear.
However, this is hosted as a client site as a sub-domain on my server. I went to the main/parent domain and allowed the action through the Wordfence firewall ther and the error was eliminated and the save action worked.
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This reply was modified 5 years, 5 months ago by phlume.
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This reply was modified 5 years, 5 months ago by phlume.