There are some possible reasons why the smart contract report “Cannot estimate the gas cost” error:
1) There are not enough tokens to finished the transaction (BUSD, MBOX or MEC insufficient, etc.)
2) The wallet has already interacted with this smart contract. In the wallet transaction list is a Pending transaction. The user has repeated the transaction too many times.
3) The interaction with the smart contract has been completed, but the front end has not yet been updates (clear cache), and or the user has repeated transaction too many times.
4) If using MetaMask wallet go to -> Settings - Advanced - Reset account (Resetting your account will clear your transaction history. This will not change the balances in your accounts or require you to re-enter your Secret Recovery Phrase.)
Please check your wallet and try again later.
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