cannot build

[eppesuig]

Hello,
this is the error message I get while building the project

~/temp/saturn$ go build cmd/saturn/saturn.go 
go: downloading nullprogram.com/x/optparse v1.0.0
go: downloading github.com/PuerkitoBio/goquery v1.6.1
go: downloading github.com/schollz/progressbar/v3 v3.13.1
go: downloading golang.org/x/net v0.0.0-20200202094626-16171245cfb2
go: downloading github.com/andybalholm/cascadia v1.1.0
go: downloading github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
go: downloading golang.org/x/term v0.9.0
go: downloading github.com/mattn/go-runewidth v0.0.14
go: downloading github.com/rivo/uniseg v0.4.4
go: downloading golang.org/x/sys v0.9.0
# command-line-arguments
cmd/saturn/saturn.go:39:7: undefined: idPtr

How may I solve it?

Thank you,
Giuseppe