Fail with error "Not enough allowance"

If you can't create presale by getting the error "Not enough allowance", it means you didn't allow MetaMask to transfer enough tokens for the pool. How to solve this following problem?

Revoke Smart Contract Allowances/Token Approvals

1. Visit Etherscan, BscScan for token approval checker. Enter your wallet address and find your token address.

2. "Connect to Web3" and revoke token approval.

Create Presale and Approve 100% Total Supply (Max) on MetaMask