Solana Agent Kit Token Swap Error: “First argument must be of type String or Buffer”
As a Solana developer, you are probably no stranger to the intricacies of working with the Solana blockchain. A common issue that can occur when swapping tokens in your application is an error related to the first argument passed to the SolanaAgentKit.swap function. In particular, the following code snippet illustrates this issue.
Error Details
When attempting a token swap, the following error message may appear:
Swap failed: First argument must be of type String or an instance of Solana-Program-Buffer
This indicates that the Swap method expects either a String or a Buffer (a mutable view of raw binary data) as its first argument. However, instead of a valid token symbol or bytes representing the public key of the token contract, you are specifying a string or a buffer.
Possible causes and solutions
To resolve this issue, the following may happen:
- Incorrectly configured
solana-programpackage: Make sure the
solana-programpackage is correctly installed in your Solana environment. TheBuffertype may not be available by default.
- Token symbol or key incorrect: Double check that the token symbol provided matches the actual public key of the contract you are trying to swap with. Make sure it is correct and in the expected format (e.g. “0x1234567890abcdef”).
- Buffer mismatch
: If the
solana-programpackage is installed correctly, make sure that the buffer passed as the first argument has the same length and type as specified in the code snippet.
Troubleshooting steps
To diagnose and fix the problem:
- Review the code for possible typos or incorrect types.
- Check the version of your
solana-programpackage to make sure it is compatible with Solana 1.6.x or later.
- Verify that the token symbol and key are correct and compare them to the expected format.
Sample Solution
To help you solve this problem, I have provided a modified example of how to create a token contract and use SolanaAgentKit to swap:
import { createAccount } from '@solana/web3.js';
import { Buffer } from 'solana-program';
const createTokenContract = async (accountId: string) => {
const [programId, symbol] = Buffer.from('0x1234567890abcdef', 16).slice(0, 4); // Example token symbol
const accountMeta = await createAccount(
programId,
symbol.toString(),
{ mintAddress: accountId },
{
pubkey: programId,
}
);
return programId;
};
Conclusion
If you are getting errors related to the first argument in SolanaAgentKit for token swaps, make sure your token symbols and keys are correct. Check that your solana-program package is correctly installed and up to date. If necessary, review the code to identify any possible typos or incorrect types.
With these troubleshooting steps and examples, you should be able to resolve this issue and continue working on your Solana application with confidence.
