Why there is transfer fund error when checking balance of ERC20 account

[emclab]

Here is the code to check the balance of an ERC20 account:

let a = await contractFYX.balanceOf(wallet.address);  //<<==this line causes the error below                                                        
if (a) a = parseInt(a.hex.toString(), 16)/10**18; //bigNumber returned

The contractFYX is generated with:

let contractFYX = new ethers.Contract(deployAddressFYX, fyxAbi, wallet); //<<==wallet.address is the 0x...1730d

Here is the error message in console output:

Error in transfer fund to :  Error: call revert exception (method="balanceOf(address)", errorArgs=null, errorName=null, errorSignature=null,
 reason=null, code=CALL_EXCEPTION, version=abi/5.3.0)
    at Logger.makeError (C:\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:187:21)
    at Logger.throwError (C:\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:196:20)
    at Interface.decodeFunctionResult (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\interface.js:347:23)
    at Contract.<anonymous> (C:\code\js\xjc_bbone\node_modules\@ethersproject\contracts\lib\index.js:329:56)
    at step (C:\code\js\xjc_bbone\node_modules\@ethersproject\contracts\lib\index.js:48:23)
    at Object.next (C:\code\js\xjc_bbone\node_modules\@ethersproject\contracts\lib\index.js:29:53)
    at fulfilled (C:\code\js\xjc_bbone\node_modules\@ethersproject\contracts\lib\index.js:20:58)
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  reason: null,
  code: 'CALL_EXCEPTION',
  method: 'balanceOf(address)',
  errorArgs: null,
  errorName: null,
  errorSignature: null,
  address: '...78B4B', //<<==ERC20 contract address
  args: [ '...1730d' ],  //<<==address to check the balance with
  transaction: {
    data: '0x70a0823100000000000000000000000010b368d6072107d7e92137f0d2bca0549f81730d',
    to: '0x...78B4B',
    from: '0x...1730d'
  }
}

The errors is about transfer fund which is not in the code.

[zemse]

The errors is about transfer fund which is not in the code.

I believe this is coming from your code Error in transfer fund to : as it is not in ethers js.

Also you're likely getting call revert exception because either one of your erc20 address or network is incorrect. Can you confirm that once?

[emclab]

zemse, is either to address or from address not correct? How to verify the address is correct? The network is up and running and I have verified that as a blocknumber was returned. The wallet was generated with private key and provider.

The ERC20 code is from @OpenZeppelin. In its (inheritance) IERC20 class, there is a note about event Transfer emitting at the end of balanceOf.

[emclab]

After sender and contract addresses match up, then the error disappears.