Changelog: •New! Added support for 1.21.11 • Fix! Improved error messages for users - error messages now show your current balance and required amount for better clarity • Fix! Enhanced error messages for currency restrictions - messages now explain why you cannot use a currency (permissions, world restrictions, etc.) • Fix! Improved configuration error messages - console warnings now include file paths and suggestions for fixing configuration issues • Fix! Better error recovery - invalid button amounts in GUI configs are now automatically fixed to default values instead of causing errors • Fix! Enhanced null checks - added comprehensive null and validation checks for currency operations to prevent crashes • Fix! Improved thread safety - currency withdraw and deposit operations now properly validate player state before processing • Fix! Better error logging - all error messages now include [UltraCoinFlip] prefix and helpful context for easier debugging • Fix! Configuration validation improvements - validation errors now provide clearer guidance on how to fix configuration issues • Optimize! Error message formatting - error messages now use placeholders to show formatted amounts and balances for better readability