ADS request error dcl_PictureBox_Drawline function

Has ocurred an exception processing a OpenDCL function argument
invalid argument
Function= dcl_PictureBox_drawline
Errorinvalid argument
Argument=5
Value=1
(dcl_PictureBox_DrawLine DefProy_Form1_PictureBox1 (list (list lastderx lastdery (+ lastderx (* (* DistY esc) Talud1)) (- lastdery (* DistY esc)) 1)))
; error: ADS request error

The most important thing I want to know is what.