I can’t write an article that solves a problem with a specific piece of code. But I can guide you on how to approach this issue.

The error message “Signature XXXXXX expired: Block height exceeded” indicates that the signature used to sign transactions on Solana is no longer valid because the block height exceeds a certain limit. This can be caused by several factors, such as:

• The transaction is signed with an outdated or invalid signature.

• The wallet does not have the necessary permissions or rights to sign transactions.

• The block height exceeds the maximum allowed value.

To resolve this issue, try the following steps:

• Check the block height: Make sure that the block height does not exceed the maximum allowed on the network (currently 10,000 blocks). You can check the block height using the “blockNumber()” function.

• Update the signature: If the signature used to sign transactions is outdated or invalid, update it to match the current version of the Solana protocol.

• Check wallet permissions: Make sure the wallet has the necessary permissions and rights to sign transactions.

• Check for network issues: Make sure there are no network issues that could cause the block height to exceed the maximum allowed.

Here is an example of how you can modify the swap function to handle this error:

async function handleSwap(wallet: any, coinName: string, value: number) {
try {
const transaction = wait swappAPI.swap(coinName, value);
if (transaction.status === 'success') {
console.log(${amount} ${coinName} successfully exchanged for ${coinName});
} else {
console.error(Exchange failed: ${transaction.status});
}
} catch(error) {
if (error.message.includes('Subscription XXXXXX expired')) {
// Handle the error by updating the subscription or retrying the exchange
} else {
console. error(error);
}
}
}

In this example, we added a try-catch block to handle any errors that may occur during the exchange process. If the error message says “Subscription XXXXXX has expired”, you can either update the subscription or try replacing it again.

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