Git command run within the app

Hi, I'm working on an app that uses git command. When I enabled sandbox, it works when the app is run within Xcode. When I run the app manually, it shows error:

xcrun: error: cannot be used within an App Sandbox.

Here is sample code to reproduce the problem:

let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = ["git", "--version"]


let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()


let data = pipe.fileHandleForReading.readDataToEndOfFile()


let alert = NSAlert()
if let output = String(data: data, encoding: .utf8) {
    alert.messageText = output
} else {
    alert.messageText = "***"
}
alert.runModal()