diff --git a/fields/download.go b/fields/download.go
index bc25e63..a5bdb5c 100644
--- a/fields/download.go
+++ b/fields/download.go
@@ -7,8 +7,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/ulikunitz/xz"
-	"github.com/xor-gate/ar"
 	"io"
 	"net/http"
 	"net/url"
@@ -18,6 +16,8 @@ import (
 	"strings"
 
 	"github.com/iancoleman/strcase"
+	"github.com/ulikunitz/xz"
+	"github.com/xor-gate/ar"
 )
 
 func DownloadAndExtract(downloadUrl url.URL, outputDir string) error {
@@ -49,7 +49,7 @@ func DownloadAndExtract(downloadUrl url.URL, outputDir string) error {
 		}
 	}
 	if !targetInfo.IsDir() {
-		return fmt.Errorf("fields info isn't a directory")
+		return errors.New("fields info isn't a directory")
 	}
 	return nil
 }
diff --git a/fields/main.go b/fields/main.go
index b55a39d..f0bd3ef 100644
--- a/fields/main.go
+++ b/fields/main.go
@@ -4,11 +4,12 @@ import (
 	_ "embed"
 	"flag"
 	"fmt"
-	log "github.com/sirupsen/logrus"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"
+
+	log "github.com/sirupsen/logrus"
 )
 
 func usage() {
diff --git a/fields/version.go b/fields/version.go
index c411938..677a2b2 100644
--- a/fields/version.go
+++ b/fields/version.go
@@ -3,13 +3,15 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
-	"github.com/hashicorp/go-version"
 	"go/format"
 	"net/http"
 	"net/url"
 	"os"
 	"path/filepath"
+
+	"github.com/hashicorp/go-version"
 )
 
 const (
@@ -65,7 +67,7 @@ func latestUnifiVersion() (*UnifiVersion, error) {
 		return NewUnifiVersion(firmware.Version.Core(), firmware.Links.Data.Href), nil
 	}
 
-	return nil, nil
+	return nil, errors.New("no Unifi Controller firmware found")
 }
 
 func determineUnifiVersion(versionMarker string) (*UnifiVersion, error) {