JsonRpcError(code: 5000, message: Cannot read property 'gasLimit' of undefined)

[Adebayo2016]

i keep getting the error JsonRpcError(code: 5000, message: Cannot read property 'gasLimit' of undefined)

here is my code

` Transaction transaction = Transaction.callContract(
maxGas: 100000,
gasPrice: EtherAmount.inWei(BigInt.one),
from: EthereumAddress.fromHex(account!),
contract: contract,
function: contract.function(name),
parameters: args,
);
EthereumTransaction ethereumTransaction = await EthereumTransaction(
from: account!,
to: contractAddress,
value: "0x0",
data: hex.encode(List.from(transaction.data!)),

);`


an here is my request 

`final signResponse = await wcClient.request(
  topic: _sessionData!.topic,
  chainId: "eip155:80001",
  request: SessionRequestParams(
      method: 'eth_sendTransaction',
      params: [ethereumTransaction.toJson()]),
);
return signResponse;

}`