What version of Go are you using (go version)?

$ go version
go version go1.15.7 

Does this issue reproduce with the latest release?

What operating system and processor architecture are you using (go env)?

$ go env

set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\Faizii\AppData\Local\go-build
set GOENV=C:\Users\Faizii\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\Faizii\Go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\Faizii\Go;
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\GO
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\GO\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\Faizii\Go\src\c\chess\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\Faizii\AppData\Local\Temp\go-build578196042=/tmp/go-build -gno-record-gcc-switches

my_project.zip

What did you do?

After getting the any package with "go get " command or after changing the version of package in my go.mod file, then I used the "go mod vendor" it started to give the following error:

Inconsistent vendoring detected. Please re-run "go mod vendor".
See #39164 for more detail on this issue.

What did you expect to see?

I need to import the package and want to accessing its functionalities

What did you see instead?

Inconsistent vendoring detected. Please re-run "go mod vendor".
See #39164 for more detail on this issue.