I do not know why you received this error but our tech group will investigate and see why this error happened.
it is just this one that you got the error, so we will try to investigate it for you.
The unit amount has changed from mBtc to Btc, I guess that's the cause. Maybe the system detects something abnormal and when I look at his post, this happens the second time.
Seems, the casino has got many players to come, when claiming the free code I got
the maximum number of times for this period!. or they limiting participants.