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@aftabkhan10, thanks for your reply!

I found the issue was my blog was too long. It appears Steemit allows only about 50,000 characters, including spaces.

Oh its good that you sort it out :)

Yes! The answer can help other Steemians who encounter the same situation.

I just got this error and I see my post is 6300 words odd - so I'll just break my post into 2 different posts - probably a good idea anyway. Thanks for help!