MySql On XAMPP Shutdown unexpectedly - php

Question

I just start mysql but there is some error. I have config my.cnf and descrease innodb_buffer_pool_size to 64 MB but nothing happend.
/*this showed in xampp*/
9:34:39 AM [mysql] Error: MySQL shutdown unexpectedly.
9:34:39 AM [mysql] This may be due to a blocked port, missing dependencies,
9:34:39 AM [mysql] improper privileges, a crash, or a shutdown by another method.
9:34:39 AM [mysql] Press the Logs button to view error logs and check
9:34:39 AM [mysql] the Windows Event Viewer for more clues
9:34:39 AM [mysql] If you need more help, copy and post this
9:34:39 AM [mysql] entire log window on the forums
then i see to the mysql error log. it shows.
/*this showed in error log*/
2016-05-19 00:34:02 3968 [Note] Plugin 'FEDERATED' is disabled.
2016-05-19 00:34:02 c4c InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator.
2016-05-19 00:34:02 3968 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-05-19 00:34:02 3968 [Note] InnoDB: The InnoDB memory heap is disabled
2016-05-19 00:34:02 3968 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2016-05-19 00:34:02 3968 [Note] InnoDB: Memory barrier is not used
2016-05-19 00:34:02 3968 [Note] InnoDB: Compressed tables use zlib 1.2.3
2016-05-19 00:34:02 3968 [Note] InnoDB: Not using CPU crc32 instructions
2016-05-19 00:34:02 3968 [Note] InnoDB: Initializing buffer pool, size = 16.0M
2016-05-19 00:34:02 3968 [Note] InnoDB: Completed initialization of buffer pool
2016-05-19 00:34:02 3968 [Note] InnoDB: Highest supported file format is Barracuda.
2016-05-19 00:34:02 3968 [Note] InnoDB: 128 rollback segment(s) are active.
2016-05-19 00:34:02 3968 [Note] InnoDB: Waiting for purge to start
2016-05-19 00:34:02 3968 [Note] InnoDB: 5.6.24 started; log sequence number 1665234
2016-05-19 00:34:02 3968 [Note] Server hostname (bind-address): '*'; port: 3306
2016-05-19 00:34:02 3968 [Note] IPv6 is available.
2016-05-19 00:34:02 3968 [Note] - '::' resolves to '::';
2016-05-19 00:34:02 3968 [Note] Server socket created on IP: '::'.
2016-05-19 00:53:44 2936 [Note] Plugin 'FEDERATED' is disabled.
how should i fix it?