It's a known bug that has already been reported to Seuntjie and will be fixed in the next version of DiceBot that is going to be out anytime soon (hopefully).
We're currently aware of a workaround (somehow) you can utilize until then, even though it's not that comfortable.
Try the following:
1) Log into crypto-games using any other coin than bitcoin, use your username and API key to log in.
2) Close DiceBot
3) Open it up again, select cg, but don't select any coin
4) You should be abled to place bets at crypto-games/bitcoin that way
This bug/error is on bitcoin only, all other coins we feature are not affected by it.
Thank you all!!! i could login with your advise