when i run main go i have error :

[girs1982]

cannot find package "github.com/machinebox/sdk-go/facebox" in any of:
and others

all:
gansta@gansta-desktop:/Downloads/detec/webcamFacebox$ go run main.go
../../../go/src/github.com/machinebox/sdk-go/facebox/facebox_check.go:12:2: cannot find package "github.com/pkg/errors" in any of:
/usr/local/go/src/github.com/pkg/errors (from $GOROOT)
/home/gansta/go/src/github.com/pkg/errors (from $GOPATH)
gansta@gansta-desktop:/Downloads/detec/webcamFacebox$