In playlist load() add an error message.

internal/radio/playlist.go

@@ -4,6 +4,8 @@ import (
 	"os"
 	"strings"
 	"sync"
+
+	"github.com/pkg/errors"
 )
 
 // Playlist holds a list of paths to a song files.
@@ -46,7 +48,7 @@ func (p *Playlist) Next() (song string) {
 func (p *Playlist) load() error {
 	data, err := os.ReadFile(p.filePath)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "cannot open a playlist file")
 	}
 	p.Lock()
 	p.playlist = strings.Split(string(data), "\n")