BLOG Message Add - Invalid conversation post token.

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Hi
I've no idea where to start with this one. I am using Oh Love theme for my blog website. It's all set up and when testing the website as a user and trying to add a message under a blog post I get the following message: INVALID CONVERSATION POST TOKEN.
Hoping someone can help and point me in the right direction on how to fix this.
Thanks in advance!
Bee