Gin Error occured while building or running.

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Description

Error occured while building or running for go modules.

..\..\..\go\pkg\mod\github.com\gin-gonic\gin@v1.7.2\binding\yaml.go:12:2: missing go.sum entry for module providing package gopkg.in/yaml.v2; to add:
        go mod download gopkg.in/yaml.v2

go mod tidy is not working. And I tryed go get -u to update modules but more errors occured.

How to reproduce

Even this can cause the error.

package main

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

func main() {
    g := gin.Default()
    g.GET("/hello/:name", func(c *gin.Context) {
        c.String(200, "Hello %s", c.Param("name"))
    })
    g.Run(":9000")
}

Expectations

$ curl http://localhost:8201/hello/world
Hello world

Actual result

$ curl -i http://localhost:8201/hello/world
<YOUR RESULT>

Environment

• go version:go1.16.2
• gin version (or commit ref):v1.7.2
• operating system:windows/amd64 win10

Comment From: Mmx233

I don't know what happend. But it recoverd suddenly.

Comment From: dengyunsheng250

yes,i have meet this problem also.

Comment From: dengyunsheng250

i found that if use go mod vendor it may be normal