diff --git a/file.go b/file.go
index d93a6e7..604bd02 100644
--- a/file.go
+++ b/file.go
@@ -86,12 +86,15 @@ func (f *File) Do(CmdTimeout time.Duration) (string, error) {
 	}
 	f.owner.log.Info("DO: ", f.Cmd)
 	done := make(chan string, 1)
+	var b bytes.Buffer
+	cmd.Stdout = &b
+	cmd.Stderr = &b
+	err := cmd.Start()
+	if err != nil {
+		f.owner.log.Error("cmd start error: ", err)
+		panic(err)
+	}
 	go func() {
-
-		var b bytes.Buffer
-		cmd.Stdout = &b
-		cmd.Stderr = &b
-		cmd.Start()
 		f.pid = cmd.Process.Pid
 		cmd.Wait()
 		done <- b.String()