provider.estimateGas doesn't work with a non-zero value

[dimmil123]

I'm getting some errors related to provider.estimateGas. It works with a value of 0 wei but anything else gives some sort of error.

console.log('a');
const estimatedGas = await provider.estimateGas({
  to: contract,
  data: encodedPayload,
  value: utils.parseEther('0'),
});
console.log('b', estimatedGas);

Works fine, console logs

a
b BigNumber {_hex: '0x0161d9', _isBigNumber: true}

However,

console.log('a');
const estimatedGas = await provider.estimateGas({
  to: task.contract,
  data: encodedPayload,
  value: utils.parseEther('.01'),
});
console.log('b', estimatedGas);

gives the error

Error: cannot estimate gas; transaction may fail or may require manual gas limit [ See: https://links.ethers.org/v5-errors-UNPREDICTABLE_GAS_LIMIT ]

and console logs only a. Any lines of code below it don't run.

[ricmoo]

That probably means the contract method is not payable. If you send ether to a non-payable method, it will revert (a non-=payable function effectively has an implicit require(msg.value == 0); at the top of the method.