在使用模块的是否报错

gin-blog go run main.go 
build command-line-arguments: cannot load github.com/ugorji/go/codec: ambiguous import: found github.com/ugorji/go/codec in multiple modules:
        github.com/ugorji/go v1.1.4 (/Users/fangqi/go/pkg/mod/github.com/ugorji/go@v1.1.4/codec)
        github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 (/Users/fangqi/go/pkg/mod/github.com/ugorji/go/codec@v0.0.0-20181209151446-772ced7fd4c2)
➜  gin-blog rm -rf main

解决方法：

修改go.mod文件添加一行，如果使用goland他会提示你问题，保持就好了。

replace github.com/ugorji/go v1.1.4 => github.com/ugorji/go/codec v0.0.0-20190204201341-e444a5086c43

完整的go.mod文件

module gin-blog

go 1.12

require (
    github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755
    github.com/astaxie/beego v1.11.1
    github.com/dgrijalva/jwt-go v3.2.0+incompatible
    github.com/fvbock/endless v0.0.0-20170109170031-447134032cb6 // indirect
    github.com/gin-gonic/gin v1.4.0
    github.com/go-ini/ini v1.42.0
    github.com/jinzhu/gorm v1.9.8
    github.com/swaggo/gin-swagger v1.1.0
)

replace github.com/ugorji/go v1.1.4 => github.com/ugorji/go/codec v0.0.0-20190204201341-e444a5086c43