MySQL Master-Slave-Slave Configuration -error 1236

I currently have a Master (5.5) - Slave (5.6) set up right now and I would like to add another slave that will replicate from the existing slave.

On the existing slave:

1. STOP SLAVE;
2. SHOW SLAVE STATUS;
3. Note these values Master_Log_File: mysql-bin.018098 & Read_Master_Log_Pos: 185753950
4. FLUSH TABLES WITH READ LOCK;
5. Service mysql stop
4. Took snapshot of mysql data vol and restore it on new mysql slave server, also I changed the server-id in my.cnf on the new mysql slave.
5. service mysql start.
6. UNLOCK TABLES;

on the new mysql slave server (should replicate from the existing slave):

1. changed server-id on my.cnf
2. remove /mnt/data/mysql/auto.cnf
3. service mysql start --skip-slave-start

4.
CHANGE MASTER TO MASTER_HOST='existing slave',
MASTER_USER='xxx',
MASTER_PASSWORD='xxx',
MASTER_LOG_FILE='mysql-bin.018098',
MASTER_LOG_POS=185753950;

5. execute start slave

got an error:
2016-11-18 16:39:50 5736 [ERROR] Error reading packet from server: Could not find first log file name in binary log index file (server_errno=1236)
2016-11-18 16:39:50 5736 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file', Error_code: 1236
2016-11-18 16:39:50 5736 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.018098', position 185753950

Thanks !!