The named parameter should be followed with the equal/greater than signs (=>), which point to the actual parameter that follows the named parameter. For example, if you intend to change the milliseconds in the SET_TIMER Built-in you can directly use that parameter with the following syntax:
SET_TIMER(timer_name => 'my_timer', milliseconds => 12000,Also, you can continue to call the Built-in with the following syntax:
SET_TIMER('my_timer', 12000, NO_REPEAT);