Why am I getting a "compile: version "go1.9" does not match go tool version "go1.9.1"" error in my Go application?

Compile Error: Version Mismatch

When encountering the error "compile: version "go1.9" does not match go tool version "go1.9.1"" while running a Go application, it indicates a mismatch between the Go version used to compile the program and the version provided by the 'go' tool.

Possible Causes

• Most commonly, the issue occurs when the Go version installed on your system is different from the version specified in your code.
• In your case, your system has Go 1.9.1 installed, but your code is specifying Go 1.9.

Solution

To resolve this error, you can follow these steps:

Check Your Go Version

Verify that the Go version installed on your system matches the version specified in your code. Use the following command to display your Go version:

go version

Update Your Go Distribution

If necessary, update your Go distribution to the version specified in your code. You can download the latest version from the official Go website or use the 'brew' package manager if you are using macOS:

brew install go@1.9.1

Specify the Correct Go Version

Modify your code to specify the correct Go version. In your case, replace "go1.9" with "go1.9.1" in the import statement:

package main

import "fmt"
import "go1.9.1/os"

func main() {
    fmt.Println("Hello, Go!")
    os.Exit(0)
}

Note: If you installed Go using the 'brew' package manager on macOS, you may need to set the $GOROOT environment variable in your shell configuration file. Add the following line to your .bash_profile, .zshrc, or .config/fish/config.fish file:

export GOROOT=/usr/local/opt/go/libexec

Once you have made these changes, recompile your program and the error should disappear.

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