Welcome to the dark arts of ArchiCAD.
In locating a "glitch," trouble-shooting means to reduce problem possibilities to one - like a mechanic would. You try options that give clues to the problem.
So maybe it is the wall itself. Try a new wall or a slightly relocated wall.
A scripting error means that an element script (the code behind what you see and manipulate) can't cope with the stuation it is in, resulting in an error, like cutting a slice from a wall and coloring it black.
This looks like an SEO gone wild - some kind of WALLHOLE command possibly associated with a trim piece....