I got this below error while compiling the contract...

ParserError: Expected a state variable declaration. If you intended this as a 
fallback function or a function to handle plain ether transactions, use the
"fallback" keyword or the "receive" keyword instead. 
--> contracts/mintableERC20.sol:212:34: | 212 | function () external payable { | ^

The fallback function is as given below:

function () external payable {
  • You should be able to remove the fallback function entirely. The default fallback function reverts when ether is sent to the contract. – Ismael Jun 4 at 4:46

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