Error: The InnoDB memory heap is disabled

This is not really an error, just an indication that InnoDB is using the system's native memory allocator instead of its own. This is also clearly marked by the severity: [Note].

On modern systems this is mostly a good choice for production. Thus the default is ON:

mysql> SHOW GLOBAL VARIABLES LIKE 'innodb_use_sys%';
+-----------------------+-------+
| Variable_name         | Value |
+-----------------------+-------+
| innodb_use_sys_malloc | ON    |
+-----------------------+-------+

This MySQL variable is deprecated, and will be removed in a future MySQL version above 5.6.

See also: Configuring the Memory Allocator for InnoDB