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Metamask Contract Factory Error: “Missing Links”

When deploying your smart contracts, especially when integrating third-party libraries, you often encounter deployment issues. A common issue is when hardhat encounters errors that require additional library dependencies to be included in the contract linker configuration.

In this article, we’ll dive into the specifics of Metamask and ethers.js integrations via Hardhat, explore why the “Contract is missing links” error occurs, and provide steps to resolve this issue.

About Contract Linker Configuration

When deploying a smart contract with external libraries, the linker configuration plays a crucial role in ensuring that all required dependencies are included. The contract linker configuration determines which dependencies are linked into the contract binary.

In Metamask, you can use the --network flag to specify a network and then request specific library dependencies. For example:

npx hardhat network metamask --network solana dev --proxy

“Contract does not contain links” error

When Metamask encounters the following error message:

Contract does not contain links for the following libraries: [library1], [library2]...

it means that hardhat is unable to determine which dependencies are required by the contract. This can happen for various reasons, such as:

  • The contract’s linker configuration is incomplete or incorrect.
  • A library dependency is not specified correctly using the --network flag.
  • An external library requires additional compilation steps (e.g. a Webpack configuration file).

Error Resolution

To resolve this issue, follow these steps:

  • Check your contract linker configuration: Verify that your contract linker configuration accurately specifies all required library dependencies using the --network flag.
  • Use the --proxy flag correctly

    : Make sure you use the correct proxy URL for each network.

Example Configuration

Here is an example of a complete configuration:

const hardhatConfig = {
// Your MetaMask account and network (e.g. solana)
networks: {
solana: {
name: 'solana',
host: '
// Specify the proxy URL using the --proxy flag
proxy: {
// Example proxy configuration with a custom Webpack configuration file
https: (addr) => ${addr}.unpkg.com,
},
},
},
};

  • Check your library dependencies: Make sure all required libraries are specified correctly using the --network flag and included in your contract’s linker configuration.

Additional tips

  • Use a webpack.config.js file to configure Webpack for your project.
  • Verify that any custom proxy configurations or build steps are implemented correctly.

By following these guidelines, you should be able to resolve the “Contract is missing links” error and successfully deploy your smart contracts with external libraries using Metamask and ethers.js.

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