GMOD13 timers!

Ok, I haven’t coded in a long time and I am returning to GMod13. (Which has a tonne of lua changes/updates)

My timer has stopped working.

Here is the timer I have as an example:

[lua] if SERVER then
timer.Simple(1.5, whatlol);
end
end [/lua]

Here is the error the console now prints:

Timer Failed! [Simple][@gamemodes/darkrp/entities/weapons/lockpick/shared.lua (line 113)

How would I go about correcting this to work with Garry’s new timer format?
Can anyone help me out with this?

Massive thank-you in advance for any info/help.

EDIT:

Ok, I tried this and it still refuses to work.

[lua] if SERVER then
timer.Simple( 1.5, function() whatlol end );
end
end[/lua]

Ideas?