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This error indicates that the Node.js file system module ('fs') is not available or cannot be found in the context of the SendGrid contact form using NextJs. This could be due to a variety of reasons such as missing or incompatible dependencies, incorrect path/file naming, or configuration errors in the application setup. In order to resolve this issue, it may be necessary to review the code and dependencies, ensure that the necessary modules are installed correctly, and check for any other configuration or compatibility issues that could be causing the problem.