我有基于樣本項(xiàng)目設(shè)置此文章。這是我的目錄結(jié)構(gòu)：goloang/└── fooproject    └── src       ├── foo       │   └── foo.go       └── fooer           └── fooer.go我已經(jīng)設(shè)置了 GOTPATH$ echo $GOPATH/Users/Bharat/Dev/golang/fooproject我正在嘗試運(yùn)行，foor.go但即使它存在于GOPATHie in引用的位置中，我也會(huì)收到找不到包錯(cuò)誤src/foo。這是我運(yùn)行它的方式：$ pwd/Users/Bharat/Dev/goloang/fooproject/src/fooer$ go run fooer.go fooer.go:4:3: cannot find package "foo" in any of:    /usr/local/go/src/foo (from $GOROOT)    /Users/Bharat/Dev/golang/fooproject/src/foo (from $GOPATH)這些是文件內(nèi)容。src/foo/foo.go：package fooimport (  "fmt")func Bar() {  fmt.Println("bar")}src/fooer/fooer.go：package mainimport (  "foo")func main() {  foo.Bar()}當(dāng)我嘗試這樣做時(shí)，我遇到了同樣的錯(cuò)誤go build fooer.go。項(xiàng)目結(jié)構(gòu)哪里出了問題？