Why Is My Go Project Failing With 'go.mod file not found'?

Understanding the "go.mod file not found" Error

When working with Go modules, encountering the error "go: go.mod file not found in current directory or any parent directory" can be frustrating. This article explores the cause and offers a solution to this issue.

Cause:

The error occurs when Go detects the absence of a "go.mod" file in the current directory or any of its parent directories. This file is crucial for managing module dependencies and is essential for building Go applications.

Fix:

Following the guide in the original question, setting the "GO111MODULE=on" environment variable may not resolve the issue. Instead, the correct solution is to set it to "GO111MODULE=off":

go env -w GO111MODULE=off

By setting "GO111MODULE" to "off," Go will disable module mode and revert to the behavior prior to Go modules. This allows you to bypass the need for a "go.mod" file for building your application.

Note: This solution only works for projects that do not use Go modules. If you are using modules, you should create a "go.mod" file and manage your dependencies accordingly.

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