Unable to get the package from the module

Question

I am trying to create a microservice application, which depends on my net module which contains general errors (so i don't have to "replicate" them across all of my modules).

The issue is that for some reason it is able to find the module, but then telling me that the modules has no package (the net module does not have the main.go file, since it is just a group of files which are used across other projects)

go: finding github.com/USERNAME/net latest
build github.com/USERNAME/micro-helix: cannot load github.com/USERNAME/net: module github.com/USERNAME/net@latest found (v0.0.0-20191209010811-97a65ac0928c), but does not contain package github.com/USERNAME/net

And here is the go.mod file containing all the necessary requirements (as far as i am concerned):

module github.com/USERNAME/micro-helix

go 1.13

require (
    github.com/USERNAME/net v0.0.0-20191209010811-97a65ac0928c
    github.com/USERNAME/service v0.0.0-20191209005400-57ee0eb02082
    github.com/golang/protobuf v1.3.2
    github.com/hashicorp/consul/api v1.3.0 // indirect
    github.com/micro/go-micro v1.17.1
    github.com/micro/go-plugins v1.5.1 // indirect
    github.com/nats-io/nats-streaming-server v0.16.2 // indirect
    github.com/nats-io/stan.go v0.5.2 // indirect
    github.com/nicklaw5/helix v0.5.4
    github.com/spf13/viper v1.5.0 // indirect
)

The go.mod file for the net module is as simple as:

module github.com/USERNAME/net

go 1.13

If you need any further clarification, i am here to provide. I know that this might be some rookie mistake (misconfiguration) but this is my first week actually trying to write something in Go.

Update #1

This is the structure of the github.com/USERNAME/net module

/-
    errors/
        -   error.go            // github.com/USERNAME/net/errors
        -   code.go             // github.com/USERNAME/net/errors
    proto/
        -   error.pb.go         // github.com/USERNAME/net/proto
        -   response.pb.go      // github.com/USERNAME/net/proto
    errors.proto
    go.mod                      // module github.com/USERNAME/net
    response.proto

Answer 1

Probably you've imported your module from some of *.go files in github.com/USERNAME/micro-helix as github.com/USERNAME/net.

You must import all of subpackages (which you use in that file) by there full paths like

import (
    "github.com/USERNAME/net/errors"
    "github.com/USERNAME/net/proto"
)