Update RpcError.cs (#3498)

src/Plugins/RpcServer/RpcError.cs

@@ -55,7 +55,7 @@ public class RpcError
         public static readonly RpcError AlreadyInPool = new(-503, "Already in pool");
         public static readonly RpcError InsufficientNetworkFee = new(-504, "Insufficient network fee");
         public static readonly RpcError PolicyFailed = new(-505, "Policy check failed");
-        public static readonly RpcError InvalidScript = new(-509, "Invalid transaction script");
+        public static readonly RpcError InvalidScript = new(-506, "Invalid transaction script");
         public static readonly RpcError InvalidAttribute = new(-507, "Invalid transaction attribute");
         public static readonly RpcError InvalidSignature = new(-508, "Invalid signature");
         public static readonly RpcError InvalidSize = new(-509, "Invalid inventory size");