Commiting Schemas to DB error

[Menoo Trogdor]

I'm new to MySQL (and databases in general). I tried creating a few tables in a new schema using MySQL Workbench. I attempted to "Synchronize Model with Database" but it completed with errors. I checked in MySQLWorkbench-->MySQL tab-->Navigator.Schemas (refreshed the view), and only ONE of the tables I created appears there (tblComtemporaryrates).

I am using MySQL 5.7.16 Win64.
MySQL Workbench: 6.3.7 (build 1199CE)

Can anyone please lead me in the right direction? I came from Access as a novice and this system is very different.

The error was....
-------------------------------------------------------------------------
Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NULL DEFAULT CURRENT_TIMESTAMP,
`update_time` NULL)
ENGINE = InnoDB
DEFAULT C' at line 2
SQL Code:
CREATE TABLE IF NOT EXISTS `mydb`.`timestamps` (
`create_time` NULL DEFAULT CURRENT_TIMESTAMP,
`update_time` NULL)
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8

SQL script execution finished: statements: 3 succeeded, 1 failed

Fetching back view definitions in final form.
Nothing to fetch