How can I fix the Go error that appears after restarting the terminal that no downloaded packages we-CodePudding

Wrote a simple program for the test:

package main
import (
    "fmt"
    "github.com/labstack/echo/v4"
)
func main() {
    e := echo.New() 
    fmt.Printf("YEEEEEEES!")
    e.Logger.Fatal(e.Start(":1323"))
}

And when go run main.go it prints YEEEEEEES! and starts the server :1323.

But after restarting (close and reopen) the terminal (Bach) and re-entering (in the same path) the same command go run main.go already produces an error:

main.go:4:2: cannot find package "github.com/labstack/echo/v4" in any of: 
        C:\Program Files\Go\src\github.com\labstack\echo\v4 (from $GOROOT)
        C:\Users\lol20\go\src\github.com\labstack\echo\v4 (from $GOPATH)

Assumed that the problem could be in Echo, but with Iris the situation was the same.

Checked, the computer has a path C:\Users\lol20\go\src\github.com\labstack\echo, but no C:\Users\lol20\go\src\github.com\labstack\echo\v4 (difference in \v4 at the end). I suppose this is the problem, because from the error it is clear that the search is performed in the path C:\Users\lol20\go\src\github.com\labstack\echo\v4.

Please tell me what is the problem and how to fix it(

CodePudding user response：

Try switching GO111MODULE="on" as follows: go env -w GO111MODULE=on (switching with export GO111MODULE="on" only works until the shell environment changes (before restarting the terminal))