Solana: Uncaught runtime errors: ERROR String contains an invalid character base64ToUint8Array

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Error Message Analysis

The error message ERROR String contains invalid character indicates that there is a problem with the string literal in your codebase. Specifically, it looks like you are trying to create a Base64 encoded array using the Solana base64ToUint8Array() function.

In this case, the problem is that the base64ToUint8Array() function expects a valid base64 encoded byte string as input. However, your code is trying to pass it an invalid string.

Possible Cause

This error could be caused by one or more of the following:

• Incorrect Base64 Encoding: Make sure that you are encoding and decoding your strings correctly using Base64 encoding. You can use online base64 validators to validate your input.

• Incorrectly formatted input string: Check that the input string is properly formatted, with no leading or trailing whitespace, and no special characters other than those allowed in a base64-encoded byte array (e.g. +/--= ).

• Incorrect character encoding: In the Solana runtime, the character set used for encoding and decoding must be the same as the one used for input/output operations. Make sure that your code sets the character encoding correctly.

Troubleshooting steps

To resolve this issue, try the following:

• Check Base64 encoding: Use online Base64 validators to check that the input string is correctly encoded.

• Validate input string: Make sure that the input string does not contain any leading or trailing whitespace, and contains only legal characters (e.g. letters, numbers, special characters).

• Check the character encoding: Confirm that the character encoding used for input/output operations is compatible with the Solana runtime.

• Test with a sample string: Try creating a sample Base64 encoded byte array using base64ToUint8Array() and pass it to your code to see if the issue still occurs.

GitHub repository

Here is an example of how you could modify the front-end and back-end code to fix this error:

// In frontend.js
const base64 = require('base64-js');
function createBase64ByteString(input) {
const encoded = base64.stringify(input);
return encoded;
}
// In backend.js
asynchronous function main() {
try {
// Create a sample input string using the correct character set (e.g. "hello")
const inputString = 'hello';
// Use createBase64ByteString function to encode the input string as a Base64 encoded byte array
const base64EncodedArray = createBase64ByteString(inputString);
console.log(base64 encoded array);
} catch ( error ) {
console.error(error);
}
}

By following the troubleshooting steps below and using online validation tools, you should be able to resolve the Solana runtime errors. If you try these solutions and the problem persists, please provide more detailed information about your source code and error messages so we can assist you further.

Note: Since this is a GitHub repository, be sure to commit any changes that address the issue and upload the updated codebase to your repository.