Vgo构建会触发“未知指令：执行”？

Any vgo command shows the same error with parsing go.mod file. unknown directive: go

Here is my go.mod file:

module github.com/SvitlanaShepitsena/surf

go 1.13

require (
    github.com/PuerkitoBio/goquery v1.5.0
    github.com/headzoo/surf v1.0.0 // indirect
    github.com/headzoo/ut v0.0.0-20181013193318-a13b5a7a02ca // indirect
    gopkg.in/headzoo/surf.v1 v1.0.0
)

I am using go1.13beta1 version.