How to Fix the 'Package Not in GOROOT' Error When Using Go Modules?

Resolving "Package Not in GOROOT" Error for Go Modules

A common issue encountered when working with Go modules is receiving the error message "package [package name] is not in GOROOT." This error is generally caused by improper configuration of environment variables.

Solution

To resolve this error, ensure that the following environment variables are correctly set:

• GO111MODULE: Set to "on" to enable modules support.
• GOPATH: The path to a workspace directory for modules, which should be outside the GOROOT directory.
• GOROOT: The installation location of the Go SDK.
• PATH: Include $GOPATH/bin and $GOROOT/bin in the path.

Configuration in Bash

In the .bashrc file, add the following lines:

export GO111MODULE=on
export GOPATH=/path/to/workspace
export PATH=$PATH:$GOPATH/bin:$GOROOT/bin
export GOROOT=/path/to/GOROOT

After Configuration

After setting the environment variables, source the .bashrc file to load the changes.

source ~/.bashrc

Go Module Workflow

To use Go modules, follow these steps:

1. Create a new main project directory.
2. Inside the main directory, run go mod init main.
3. Create a subdirectory for the new package, e.g., package1.
4. Within package1, create files with the package package1 header but omit the go.mod file.
5. In main.go, import and use the package from main/package1.

By following these steps and ensuring proper environment configuration, the "package not in GOROOT" error can be resolved.

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