Total Ascent

I´m trying to use total ascent but i can not format the number


i use this on class

var totalAscent;

this on function

gpsSignal = info.currentLocationAccuracy;

and this on update and returns me 

textC(dc, 170, 9, Gfx.FONT_TINY, totalAscent.format("%.0f")); 



and returns me this only when i include the .format string

i haver tried to convert to number or to float with same results

Error: Unexpected Type Error

Details: Failed invoking <symbol>

Stack: 

  - onUpdate() at /Users/lcda/Downloads/SDK/PowerEdgeField/PowerEdgeField-master/source/PowerEdgeFieldView.mc:283 0x1000135e