Is it just me or there is some problem with smartmixer. I have failed to go past the stage of order details. Whenever i click on the continue button, i get the error indicated in the picture

same problem here, even I set up all on high fee and strong.
We would like to remind you that, at the moment, we our servers are still in maintenance. That's why this error appears, when trying to process a mixing operation. Thank you for understanding. We will notify you when the maintenance is over.