Content body cannot be converted to new editor format

[Vishal Mistry]

Hi! I have a python script that currently looks into a yaml file, and separates each of the contents within the yaml file into different confluence pages underneath parent page. 

I have come across an error which i can see from other posts have suggested to check for any & symbols, to add a user agent but no luck in fixing it for mine.Any help would be greatly appreciated!

{"statusCode":400,"data":{"authorized":true,"valid":true,"errors":[],"successful":true},"message":"com.atlassian.confluence.api.service.exceptions.BadRequestException: Content body cannot be converted to new editor format"}

[Vishal Mistry]

For more context, the pages update fine usually but I have added a basic divider "+++++" on the page and when i input any content on the page above this divider it should be able to obtain that and then re-output this along with updated content from the yaml file below the divider. When i add text or anything above the divider and run the script thats when I get the issue

[Vishal Mistry]

Any help would greatly be appreciated!