...made buttons...placed them in level folder...include code...

Stuck in run level.I don`t no what is this error and what to do next:

Error E1515
Invalid arguments in showPlslPan: plSelectionPan.ps_x=(screen_size.x-bmap_width(plSelectionPan.bmap))/2
Next error is:
Crash in showPlslPan...

What to replace with what?