expects import "go.mongodb.org/mongo-driver/mongo"

[xyths]

main.go:8:2: code in directory $GOPATH/src/github.com/mongodb/mongo-go-driver/mongo expects import "go.mongodb.org/mongo-driver/mongo"

seem code moved from "go.mongodb.org/mongo-driver" to "github.com/mongodb/mongo-go-driver/"?

[WuShaoQiang]

You should import "go.mongodb.org/mongo-driver" instead of "github.com/mongodb/mongo-go-driver".
See if it works?