I try to vote to close a question, but am greeted with this error message:

[!["You may only load the close dialog every 3 seconds][1]][1]

So I patiently wait until 3 seconds have passed, try again, and get the same error, over and over again. What is wrong here? [1]: https://i.sstatic.net/g7sBT.png

I try to vote to close a question, but am greeted with this error message:

So I patiently wait until 3 seconds have passed, try again, and get the same error, over and over again. What is wrong here?