cannot find package "github.com/gorilla/mux" in any of: - go

Question

I use command go get github.com/gorilla/mux. I made http server using Golang, and I run this program :
package main
import (
"fmt"
"html"
"log"
"net/http"
"github.com/gorilla/mux"
)
func main() {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/", Index)
log.Fatal(http.ListenAndServe(":8080", router))
}
func Index(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
But I conflict this error :
/usr/local/go/bin/go build -i [/Users/imac/go/src]
http.go:9:5: cannot find package "github.com/gorilla/mux" in any of:
/usr/local/go/src/github.com/gorilla/mux (from $GOROOT)
($GOPATH not set)
Error: process exited with code 1.
My Go environment is here :
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/imac/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/v9/fkc_t97s5v1g9sr938zzvxvh0000gn/T/go-build096571864=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
I fight with this error for a week, But I can't find out solution. Please help me.

Answer 1

Could you try this steps to debug it:
ls -l /usr/local/go/src/github.com | grep gorilla
cd $GOPATH
go list ... | grep gorilla
if you din't see gorilla in the above two command, then you need to install it:
go get -v -u github.com/gorilla/mux
Please run this: export PATH=$PATH:$GOPATH/bin
How about running go run main.go ? is that working, if yes you should be able to do go build from your project path.

Answer 2

I wish this helpful.
You may off the 'mod'.
$ export GO111MODULE=off

Answer 3

This works for me...
fire command
> go mod init <your-directoryNane-where-main.go-exits>
fire command > go get github.com/gorilla/mux
after firing this both commands you will be able see 2 files :
go.mod
go.sum
finally, Close VS code and open again, the error will be resolved

Answer 4

Just remove quotes like this:
go get github.com/gorilla/mux

Answer 5

If you are using VS Code as your IDE and facing this problem:
VS Code uses $HOME/go as your default GOPATH - if you export another GOPATH you running into this trouble.
How to solve:
Use the VS Code internal terminal and navigate to your project folder: cd prjectFolder. Type go env and check if the GOPATH entry is the same as you get when you use cmd+t and then >Go: Current GOPATH
If it doesn't fit, add in your user settings:
"go.gopath": "/some/path"
where /some/path is the same path you export in you shell, zsh and so on.
Hope this helps.

Answer 6

I try to remove github.com/gorilla and github.com/peterbourgon directory, then, retry: make, it works.
<pre>
fail log:
mac#user:~/TempPlace/temp/ngrok% make
go fmt ngrok/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/client/assets/assets_debug.go \
assets/client/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/server/assets/assets_debug.go \
assets/server/...
go get -tags 'debug' -d -v ngrok/...
src/ngrok/server/config.go:16:2: no Go files in /Users/apple/TempPlace/temp/ngrok/src/github.com/gorilla/mux
src/ngrok/server/config.go:17:2: no Go files in /Users/apple/TempPlace/temp/ngrok/src/github.com/peterbourgon/diskv
make: *** [deps] Error 1
success log:
mac#user:~/TempPlace/temp/ngrok% make
go fmt ngrok/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/client/assets/assets_debug.go \
assets/client/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/server/assets/assets_debug.go \
assets/server/...
go get -tags 'debug' -d -v ngrok/...
github.com/gorilla/websocket (download)
github.com/gorilla/mux (download)
src/ngrok/server/config.go:17:2: no Go files in /Users/apple/TempPlace/temp/ngrok/src/github.com/peterbourgon/diskv
make: *** [deps] Error 1
mac#user:~/TempPlace/temp/ngrok% make
go fmt ngrok/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/client/assets/assets_debug.go \
assets/client/...
go get github.com/jteeuwen/go-bindata
GOOS="" GOARCH="" go install github.com/jteeuwen/go-bindata/go-bindata
bin/go-bindata -nomemcopy -pkg=assets -tags=debug \
-debug=true \
-o=src/ngrok/server/assets/assets_debug.go \
assets/server/...
go get -tags 'debug' -d -v ngrok/...
github.com/peterbourgon/diskv (download)
github.com/google/btree (download)
go install -tags 'debug' ngrok/main/ngrok
go install -ldflags "-s" -tags 'debug' ngrok/main/ngrokd
</pre>

Answer 7

Try go build /Users/imac/go/src/project
because I see you try to use go build under /Users/imac/go/src

Answer 8

Maybe this can help other users running in Windows.
In my case I had to create two symlinks:
1. run cmd as administrator
2. cd %gopath%
3. mklink /D src pkg\mod
this creates a symlink between src and pkg\mod
4. cd src\github.com\gorilla
Here you'll notice that the mux package might be listed as mux#v1.8.0
5. mklink /D mux mux#v1.8.0
With this, go will be able to find github.com/gorilla/mux
under %gopath%\src\github.com\gorilla\mux
Finally, you have to set GO111Module to off
set GO111Module=off
and now you can build your app:
go build app.go