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Uncaught (in promise) Error: call revert exception [ See: https://links.ethers.org/v5-errors-CALL_EXCEPTION ] (method="allowance(address,address)", data="0x", errorArgs=null, errorName=null, errorSignature=null, reason=null, code=CALL_EXCEPTION, version=abi/5.7.0)
    at Logger.makeError (index.js:275:1)
    at Logger.throwError (index.js:285:1)
    at Interface.decodeFunctionResult (interface.js:423:1)
    at Contract.<anonymous> (index.js:393:1)
    at Generator.next (<anonymous>)
    at fulfilled (index.js:13:1)