First of all: welcome to the Dynatrace Community! I'm sorry you ran into this error at the very beginning of your Community journey. This is a known issue (as, unfortunately, many other) and that's why we'll be moving to a new forum platform next month.
Stay tuned for more news tomorrow!
Thanks for your patience!
PS. I moved your question to the Community Connect forum, as it refers to the Community platform rather than the product.
Just a follow-up question: were you maybe using emoticons when trying to post a question? This is the most probable reason why you were seeing the internal error.Best regards,