Dear Mr. and Ms. forum,

Uptill now things go well. But we don't understand the following
error message:

gap> Kernel(e);
Error, Record: element 'permDomain' must have an assigned value at
if not d in G.permDomain ... in
stb.operations.Stabilizer( stb, pnt, OnPoints ) called from
GroupOps.Stabilizer( G, d, opr ) called from
arg[1].operations.Stabilizer( arg[1], arg[2], arg[3] ) called from
Stabilizer( hom.source, orb, OnTuples ) called from
fun( i ) called from
..
brk>

The problem is in the computing of images.
GAP computes Image (c, A), but not e.g Image(c, A*B) (the function
Image in this example seems to work only with generators A, B).

This bug was fixed in GAP 3.1 Patchlevel 1:

This  is  the  first upgrade for  GAP 3.1.  It brings version 3 release 1
(V3R1) to version 3 release 1 patchlevel 1 (V3R1P1).

The priority of this upgrade is low.

[...]

The function 'Image' was fixed to test the cases correctly. 'Image'
signalled an error when called to compute the image of a matrix under a
mapping.

Please update to GAP 3.2, or if you do not have ftp access, try at
least to upgrade to GAP 3.1 patchlevel 3.

best wishes
Frank