diff --git a/src/Errors.ts b/src/Errors.ts
index 645771e..2f76595 100644
--- a/src/Errors.ts
+++ b/src/Errors.ts
@@ -10,7 +10,8 @@ export const enum ERROR_CODE {
     NO_SESSION_INFO,
     NO_ENCRYPTION,
     ARIA2C_CRASH,
-    NO_CONNECT_ARIA2C
+    NO_CONNECT_ARIA2C,
+    NO_DEAMON_PORT
 }
 
 
@@ -36,7 +37,9 @@ export const errors: {[key: number]: string} = {
 
     [ERROR_CODE.ARIA2C_CRASH]:          'The aria2c rpc server crashed with the previous message',
 
-    [ERROR_CODE.NO_CONNECT_ARIA2C]:     'Could not connect to Aria2c json-rpc webSocket'
+    [ERROR_CODE.NO_CONNECT_ARIA2C]:     'Could not connect to Aria2c json-rpc webSocket',
+
+    [ERROR_CODE.NO_DEAMON_PORT]:        'Could not get a free port to use'
 };