"Oops - Error 500" (new topic)

<title>Oops - Error 500</title>\n <meta http-equiv=“Content-Type” content=“text/html; charset=utf-8”>\n</head>\n<body>\n <h1>Oops</h1>\n <p>The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.</p>\n <p>Detailed information about the error was logged, and an automatic notification generated. We’ll take a look at it.</p>\n <p>No further action is necessary. However, if the error condition persists, you can provide additional detail, including steps to reproduce the error, by posting a discussion topic in the site’s feedback category.

How can I find this error that’s been logged? What would normally cause an err 500? Been getting this a lot lately via POST to create a new topic.

EDIT: Is it @ /logs? I’ve been seeing tons of log spam looking like this:

Error: Unexpected call to method or property access.
at Anonymous function (https://forum.imperium42.com/assets/application-(someLongID).js:11:20762)

EDIT 2: Also a few errors like this:

ArgumentError (invalid byte sequence in UTF-8) /var/www/discourse/lib/text_cleaner.rb:60:in `gsub’