wiggle expression - undefined value

So i have been using PT_autoexpres plugin for ages. For simple wiggle, loop operations. But.. all of a sudden the code does not work anymore. I am stumped however how to fix it. 

On the first line i know get: Error: undefined value used in expression (could be an out of array subscript?)

'Wig Amt - Position' links to an expression control slider .

The code is:

freq = 1;

amp = thisLayer.effect("Wig Amt - Position")(1);

result = wiggle(freq, amp);

[result[0],result[1],value[2]];