change ACK error codes

src/ack.h

 #ifndef ACK_H
 #define ACK_H
 
+/* Common Errors */
 #define ACK_ERROR_NOT_LIST		1
 #define ACK_ERROR_ARG			2
 #define ACK_ERROR_PASSWORD		3
 #define ACK_ERROR_PERMISSION		4
 #define ACK_ERROR_UNKNOWN		5
-#define ACK_ERROR_NO_EXIST		6
-#define ACK_ERROR_PLAYLIST_MAX		7
-#define ACK_ERROR_SYSTEM		8
-#define ACK_ERROR_PLAYLIST_LOAD		9
-#define ACK_ERROR_UPDATE_ALREADY	10
-#define ACK_ERROR_PLAYER_SYNC		11
-#define ACK_ERROR_EXIST			12
+
+#define ACK_ERROR_NO_EXIST		50
+#define ACK_ERROR_PLAYLIST_MAX		51
+#define ACK_ERROR_SYSTEM		52
+#define ACK_ERROR_PLAYLIST_LOAD		53
+#define ACK_ERROR_UPDATE_ALREADY	54
+#define ACK_ERROR_PLAYER_SYNC		55
+#define ACK_ERROR_EXIST			56
 
 #endif