Why did Mysql (MAMP) stop starting?

Question

MySQL

I don’t know why, but mysql (MAMP) stopped starting.
Here is a snippet from mysql.log:

2017-04-26 16:33:54 4241 [ERROR] InnoDB: Attempted to open a previously opened tablespace. 
Previous tablespace mysql/innodb_table_stats uses space ID: 1 at filepath: ./mysql/innodb_table_stats.ibd.
 Cannot open tablespace neft/banner which uses space ID: 1 at filepath: ./neft/banner.ibd

Here is the full log

tyts

170426 16:33:54 mysqld_safe Logging to '/Applications/MAMP/logs/mysql_error.log'.
170426 16:33:54 mysqld_safe Starting mysqld daemon with databases from /Library/Application Support/appsolute/MAMP PRO/db/mysql56
2017-04-26 16:33:54 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-04-26 16:33:54 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled
2017-04-26 16:33:54 0 [Note] /Applications/MAMP/Library/bin/mysqld (mysqld 5.6.35) starting as process 4241 ...
2017-04-26 16:33:54 4241 [Warning] Setting lower_case_table_names=2 because file system for /Library/Application Support/appsolute/MAMP PRO/db/mysql56/ is case insensitive
2017-04-26 16:33:54 4241 [Note] Plugin 'FEDERATED' is disabled.
2017-04-26 16:33:54 4241 [Note] InnoDB: Using atomics to ref count buffer pool pages
2017-04-26 16:33:54 4241 [Note] InnoDB: The InnoDB memory heap is disabled
2017-04-26 16:33:54 4241 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-04-26 16:33:54 4241 [Note] InnoDB: Memory barrier is not used
2017-04-26 16:33:54 4241 [Note] InnoDB: Compressed tables use zlib 1.2.8
2017-04-26 16:33:54 4241 [Note] InnoDB: Using CPU crc32 instructions
2017-04-26 16:33:54 4241 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2017-04-26 16:33:54 4241 [Note] InnoDB: Completed initialization of buffer pool
2017-04-26 16:33:54 4241 [Note] InnoDB: Highest supported file format is Barracuda.
2017-04-26 16:33:54 4241 [Note] InnoDB: The log sequence numbers 110999017 and 110999017 in ibdata files do not match the log sequence number 112696759 in the ib_logfiles!
2017-04-26 16:33:54 4241 [Note] InnoDB: Database was not shutdown normally!
2017-04-26 16:33:54 4241 [Note] InnoDB: Starting crash recovery.
2017-04-26 16:33:54 4241 [Note] InnoDB: Reading tablespace information from the .ibd files...
2017-04-26 16:33:54 4241 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace mysql/innodb_table_stats uses space ID: 1 at filepath: ./mysql/innodb_table_stats.ibd. Cannot open tablespace neft/banner which uses space ID: 1 at filepath: ./neft/banner.ibd
2017-04-26 16:33:54 7fffe6a063c0  InnoDB: Operating system error number 2 in a file operation.
InnoDB: The error means the system cannot find the path specified.
InnoDB: If you are installing InnoDB, remember that you must create
InnoDB: directories yourself, InnoDB does not create them.
InnoDB: Error: could not open single-table tablespace file ./neft/banner.ibd
InnoDB: We do not continue the crash recovery, because the table may become
InnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.
InnoDB: To fix the problem and start mysqld:
InnoDB: 1) If there is a permission problem in the file and mysqld cannot
InnoDB: open the file, you should modify the permissions.
InnoDB: 2) If the table is not needed, or you can restore it from a backup,
InnoDB: then you can remove the .ibd file, and InnoDB will do a normal
InnoDB: crash recovery and ignore that table.
InnoDB: 3) If the file system or the disk is broken, and you cannot remove
InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf
InnoDB: and force InnoDB to continue crash recovery here.
170426 16:33:54 mysqld_safe mysqld from pid file /Applications/MAMP/tmp/mysql/mysql.pid ended