diff --git a/realize/server.go b/realize/server.go
index 114ec73..cbc3e5f 100644
--- a/realize/server.go
+++ b/realize/server.go
@@ -14,6 +14,7 @@ import (
 	"os/exec"
 	"runtime"
 	"strconv"
+	"errors"
 )
 
 // Dafault host and port