Unable to plot response

[benissimo]

Hello everybody,
I have to plot a problem to the response of my analysis, this generally . In this particular case by a push over- analysis.
The script works fine , but if I want a plot produce , always following message appears :

>undefined function or variable "makecform"
>Error in distinguishable_colers (line 96)
>Error in plotResponse (line 50)
>Error while evaluating UIControl Callback


Can anyone help to solve this problem ?

I use Opensees Navigator.

best thanks in advance
Ben

[fmk]

what command are you issuing that is generating that?