Error when deploying Brownie scripts using Metamask

As a developer working on smart contracts on the Ethereum network, you have probably encountered problems when deploying scripts to the blockchain using the Brownie platform. In this article, we will look at the error message that Brownie generates when trying to deploy scripts using Metamask.

Error Message Explanation

The error “Non-hex digit found” is a cryptic message that indicates a problem with the code or data used in the deployment process. However, upon closer inspection, it appears to be related to the syntax of the hexadecimal values ​​used in the script.

When Brownie runs scripts using Metamask, it uses the Ethereum Virtual Machine (EVM) to execute the bytecode of smart contracts written in Solidity. The EVM interprets the hexadecimal values ​​as code and executes them accordingly.

Brownie Terminal Error

This particular error message contains the phrase “Non-hex digit found”. This is not a typical error message from Brownie itself, but rather an indication of what may be causing the problem. When running scripts using Metamask with Brownie, there may be issues with the syntax or formatting of the hexadecimal values ​​being used.

Possible Causes and Solutions

Here are some possible causes and solutions for this error:

• Invalid hexadecimal values

  : Make sure that all hexadecimal values ​​in your script are valid. Solidity hexadecimal values ​​must be between 0 and F inclusive.

• Missing or invalid ‘0x’ prefix: When writing hexadecimal values, always prefix them with ‘0x’ to indicate that they are hexadecimal (e.g. ‘0x1234567890abcdef’).

• Incorrect syntax: Check your script for syntax errors, such as missing colons or incorrect use of semicolons.

• Metamask configuration issues: Check that metamask is properly configured on your machine and that the Brownie executable can connect to it.

Sample solution

To resolve this issue, you can try running a simple test case in your script with Brownie. Here is an example of how you can modify the deploy.py file to include basic error checking:

import brown
def main():

Make sure Metamask is configured correctly
if not brown.is_metro_client_configured():
throw Exception ("Metamask configuration problem")
try:

Implement the contract with error handling
brown.run_scripts({"script": "your_script.py"})
except exception as e:
print(f"Error: {e}")
if __name__ == "__main__":
hand()

This sample code checks whether Metamask is configured correctly before attempting to deploy the script. If an error occurs, an exception message is printed.

Conclusion

The “Non-hex digit found” error in Brownie terminal output can be a difficult issue to troubleshoot, but by understanding the syntax and formatting requirements for hexadecimal values, you should be able to identify and resolve the issues. Don’t forget to verify that your Metamask configuration is correct and test your scripts with basic error checking before deploying them to the blockchain.

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