I've narrowed it down to the fact that I display some text that is not a UTF-8 character, but it's not reading it correctly. It's the upward pointing white triangle "\u25B3" - when I put that in the code, it still gives me the error

(see issue #43 for reference!)

Same problem here, plotly gives me a 500 error when I try to render a graph containing a character like "ç". However, the weird thing is that when I do ploty.plot() and click into the URL, it works perfectly fine.

Following the instructions listed in this pull request and a bit more tinkering fixed the issue for me. You basically just need to change the instructions on how the JSON gets read to include all utf-8 special characters:

Hope this helps! Worked for me.

#49

Same problem here, plotly gives me a 500 error when I try to render a graph containing a character like "ç". However, the weird thing is that when I do ploty.plot() and click into the URL, it works perfectly fine.

I hope my solution above works for you!