GO111MODULE run error

[shenxinbo]

for basic demo

package main

import "github.com/gin-gonic/gin"

func main() {
	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"message": "pong",
		})
	})
	r.Run() // listen and serve on 0.0.0.0:8080
}

if I run
go run main.go

the error is
../../../golang/pkg/mod/github.com/gin-gonic/[email protected]/binding/msgpack.go:12:2: ../../../golang/pkg/mod/github.com/ugorji/go/[email protected]/goversion_vendor_eq_go15.go:1:1: expected 'package', found 'EOF'

go version 1.11.4 with GO111MODULE=on

[jmortonTarget05]

Has there been any investigation or workaround identified?
My error is similar, but not exact. gin import appears to pull in 2 references for github.com/ugorji/codec:

/go/pkg/mod/github.com/gin-gonic/[email protected]/binding/msgpack.go:12:2: unknown import path "github.com/ugorji/go/codec": ambiguous import: found github.com/ugorji/go/codec in multiple modules:
	github.com/ugorji/go v1.1.1 (/go/pkg/mod/github.com/ugorji/[email protected]/codec)
	github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 (/go/pkg/mod/github.com/ugorji/go/[email protected])

[markhomoki]

I'm having the same issue, any thoughts?

[zaynetro]

Did you init go.mod file?

The following steps to run the project produce no errors:

$ mkdir gin-modules

$ cd gin-modules/

$ cat > main.go
package main

import "github.com/gin-gonic/gin"

func main() {
  r := gin.Default()
  r.GET("/ping", func(c *gin.Context) {
    c.JSON(200, gin.H{
      "message": "pong",
    })
  })
  r.Run() // listen and serve on 0.0.0.0:8080
}
^D

$ export GO111MODULE=on

$ go mod init .
go: creating new go.mod: module .

$ go run main.go
go: finding github.com/gin-contrib/sse latest
go: finding github.com/ugorji/go/codec latest
go: finding github.com/golang/protobuf/proto latest
go: finding gopkg.in/yaml.v2 v2.2.2
go: downloading github.com/gin-contrib/sse v0.0.0-20190124093953-61b50c2ef482
go: downloading github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2
go: downloading gopkg.in/yaml.v2 v2.2.2
[GIN-debug] [WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.

[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /ping                     --> main.main.func1 (3 handlers)
[GIN-debug] Environment variable PORT is undefined. Using port :8080 by default
[GIN-debug] Listening and serving HTTP on :8080
^Csignal: interrupt

$ go version
go version go1.11.4 darwin/amd64