When I submit MLDataLabeler HIT's very ofter Mturk shows me this error page, it's getting really frustrating. I'm using HIT Forker and JR Panda Crazy, Palemoon browser, Win 10... What causes this error? HIT error? Userscript error? Is this some kind of throttling mechanism? I have an impression that this error is shown when I work faster... I don't see any PRE's... I have read somewhere that this kind of error is caused by double-click on Submit button, I tried to tab-tab-tab... and to click "Enter" when "Submit" button is highlighted and still I receive this error. I still under impression that happens more ofter when I mouse click on "Submit" button (usually every second time, sometimes every time!) Please help, I don't know what is going on... Thanks in advance!