AFAIK, It is an internal error, so the number provided does not reflect the nature of the error, but rather the location of the error. Has your session time expired, meaning that you did not click on the link for a long time? Was the problem resolved after several refreshes of the link?
Since no one else reported this error, it is related to your browser, so deleting cookies and checking the session time will solve the problem.
I was way too lazy in describing the error
Since I was on a tablet I found it far easier to just open all tabs to send merit then type 1 and send, after 7 or 8 merits sent this error appeared, I closed it down and continued to the next and all went ok. Of course, I opened the page that got the error again and it all went smoothly.
Now that I look at the time, I am quite surprised I was doing it that fast on a 10" touchscreen with 3 seconds between actions, I was quite sure I had way more than 5 seconds between taps so that's probably the cause.
I've seen "An Error Has Occurred" many times while Meriting many posts. I don't remember any error number, but just click back, and it works again.
I kind of guessed people who merit far more often than me would have encountered it a few times but I was curious why I never saw the issue discussed, maybe I just missed the topic.
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Anyhow, it has something to do with merits and it just fixes itself, I don't think I've found a vulnerability to exploit the merit system
so unless proven wrong I guess I'll lock the topic in 12 hours or so.