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I had the same problem, even posted about it earlier.
After seeing chat message about hot wallet refill, I realized that this error was caused by the fact that how wallet ran dry.
I tested it and was able to bet with no problems. But that error is confusing and should be explained better than simple: 'you can't bet'.
yeah, sorry I missed it, and it is literary the first post of this page. apparently I am blind. although my post was partly me wanting to say something as a feedback of my experience on trying this new platform.
suffice it to say that the problem was fixed when I tried the site again today, and I have made it up to 11000 satoshi. and back to zero since I lost it all

but the platform still seems buggy. for example (812676) is supposed to be a 1000 satoshi bet but it says 1001, I don't get why I made a 1000 satoshi bet and lost 1000+1 satoshi

although it doesn't seem to be deducting that +1 satoshi from the balance.
also in my opinion the provably fair thing should be implemented on each bet. meaning if I click on any of my bet numbers (eg 812676) I should see the seed,... and be able to verify it. right now it only gives me the last bet.