Issue with RPC 'sendTransaction' using the Stellar SDK

[last ravine]

I am trying to invokeContractFunction but getting error "trying to write value to a void slot"

I have also tried sample transaction, but still getting the same error: https://developers.stellar.org/docs/data/rpc/api-reference/methods/sendTransaction

I have gone through documentation but still facing issues https://stellar.github.io/js-stellar-sdk/index.html

const transaction = new TransactionBuilder(sourceAccount, {
fee: BASE_FEE,
networkPassphrase: Networks.TESTNET
})
// Add your specific operations here. Example:
.addOperation(Operation.invokeContractFunction({
contract: contractId,
function: "set_discount",
args: [discount_factor],
source: "GCZEAIDXRPLJ5UPINK36M3FG2TP3YJHYQFBPWA6EFYWVBOC5EAWXSVTV",
}))
.setTimeout(180)
.build();

// Sign the transaction to prove you are actually the person sending it
transaction.sign(sourceKeypair);
// Submit the transaction to the Stellar network
console.log("transaction",transaction)
const transactionResult = await server.sendTransaction(transaction);

Any help will be highly appreciated!

Issue with RPC 'sendTransaction' using the Stellar SDK

@oblique gulch - Thanks, I solved this issue using your guide
https://github.com/stellar/stellar-docs/blob/cde33135c5fabf14c9ab1fa075f8c8a916770157/docs/smart-contracts/guides/transactions/simulateTransaction-Deep-Dive.mdx

[oblique gulch]

Nice!

[cyan nacelle]

If your issue isn't resolved here, please add it to our weekly dev call agenda and we will discuss it live.

[oblique gulch]

Glad it was helpful