Same thing with mine, when I tried TRX-SOL order the first time, it popped the same kind of error, I did not think the amount was the issue… I refreshed the page and repeated the process again but it kept showing the same error, it was when i reduced the amount that it went through…
I faced the same issue but it was about the detail about amount, you guys should increase the amount, you must click the max button beneath the amount option when making this order this way the problem can be solved, it is not an error although when I faced this issue it was a bit hard for me to understand what is happening, so when I give it a try I understood the error but I hope the team will change the text into an easier one for easy understanding of a normal joe.
Check the offer detail before making the transaction and then do the rest to go beyond this point.