Why Do I Get 'go: go.mod file not found' After a Go Update, and How Can I Fix It?

Resolving "go: go.mod file not found" Error after Go Update

When attempting to build a simple "Hello, World!" Go example after updating to Go version 1.16.2, you might encounter the following error:

go: go.mod file not found in current directory or any parent directory; see 'go help modules'

Attempts to resolve the issue using the suggested fix, setting GO111MODULE=on and GOPROXY=https://proxy.golang.org,direct, may not succeed.

To address this problem:

1. Set GO111MODULE=off. Instead of setting it to auto, which might cause the issue, disable module support by setting it to off. This can be done using the command:

go env -w GO111MODULE=off

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