Remap G74 using online example

Hello, first try here about the REMAP capability, and using the already existent G74 remap code on:

wiki.linuxcnc.org/cgi-bin/wiki.pl?G74_-_...illing/Face_Grooving

When I run a test code I get the following error:

Bug: Call stack underrun


Exactly what I did (using LinuxCNC 2.6.x):

1) Added to my INI file under the correct sections what is on the above web page
2) Created a folder in my config directory named 'python'
3) Created 2 files in that directory: toplevel.py and remap.py, both with the contents that is described on the page above

Am I missing something obvious? The error result (Bug: Call stack underrun) is not clear.

Thank you

I was using the python example (first one).
Did exactly the same thing on the latest stable linuxcnc version and it worked out fine, so no more problems.
Thanks