Why Am I Getting the 'Package Not in GOROOT' Error in Go, and How Do I Fix It?

Error "Package Not in GOROOT": Resolving the Issue

When running go run main.go, you may encounter the error, "package package1 is not in GOROOT (/usr/local/go/src/package1)" if the environment variables are improperly configured. To resolve this issue, meticulously follow these steps:

1. Configure Environment Variables:
   In the bashrc file, set the following environment variables:

   export GO111MODULE=on
   export GOPATH=/mnt/sda1/programming/gopath
   export PATH=$PATH:$GOPATH/bin
   export GOROOT=/usr/local/go
   export PATH=$PATH:$GOROOT/bin

2. Load bashrc File:
   Load the bashrc file into the terminal using the following command:

   source ~/.bashrc

3. Create Project Structure:
   Create a main folder and place main.go inside it. Initialize the project with the following command:

   go mod init main

   Create a separate folder for the package (e.g., package1) and place your Go files in it, but do not create a go.mod file in this folder.

4. Import Package in Main:
   In your main.go, import the package using the following syntax:

   import "main/package1"
   
   y := package1.Struct1{a: 1, b: 2,...}
   z := y.func1()

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