How work the plot properties if errorbar is used?

[Sina Calmote]

Dear all

I try to plot data with errorbars like I did in the following example for the normal plot (but without the bars):
        plot(x,y,'-*r','markersize',1.2)
but if I write:
      errorbar(x,y,ly,uy,"~","-*r",'markersize',1.2)
I get an error message:
    error: Invalid call to __errplot__. Correct usage is:
    -- Function File: H = __errplot__ (FSTR,P, ...)

but I don't understand this message and I hope someone will help me
THANKS ;)

Ursina