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There may be an issue with the content in your post.
I've seen certain code throw errors like that, but I don't know why.
I would recommend copying your main content elsewhere, clear the form and start all over.

Thanks for the reply, In the end I waited about 12 hours and posted on my desktop PC and it worked with no problems. Not sure what the issue was.

Glad you got it to work. Good luck @pandasquad!