Error code 1

[garyW17]

Hello,
I installed Prusa slicer 2.9.0, Python 3.13.1, and added the required command to the post processing script section. When I try to export gcode I get the error message below.

In addition I do see a file in my working directory named z_shift_log.txt that echoes back stuff that sounds like it is doing the right stuff, like multiplying the E value by the extrusionMultiplier. One odd thing is that in the slicer I see 254 layers, with a Z of 50.8 (mm). The last few lines of the .txt files are :

2025-01-27 16:15:20,687 - Perimeter block #4 detected at layer 253
2025-01-27 16:15:20,695 - Inserting G1 Z50.800 for non-shifted perimeter block #4
2025-01-27 16:15:20,700 - Perimeter block #5 detected at layer 253
2025-01-27 16:15:20,707 - Inserting G1 Z50.900 for shifted perimeter block #5
2025-01-27 16:15:20,712 - Multiplying E value by extrusionMultiplier
2025-01-27 16:15:20,718 - Multiplying E value by extrusionMultiplier
2025-01-27 16:15:20,724 - Multiplying E value by extrusionMultiplier
2025-01-27 16:15:20,735 - Perimeter block #6 detected at layer 253
2025-01-27 16:15:20,741 - Inserting G1 Z50.800 for non-shifted perimeter block #6
2025-01-27 16:15:20,747 - External perimeter detected at layer 253
2025-01-27 16:15:20,754 - Layer 263 detected at Z=52.800
2025-01-27 16:15:20,760 - Layer 1950 detected at Z=390.000

I do not understand why there is a layer 263 and 1950. This geometry is pretty simple, just a square tube. I have tried slicing several other .stl files and had no success so far with any of them.

The error message I get is:
Post-processing script "C:\Users\gary\AppData\Local\Microsoft\WindowsApps\python.exe" "F:\MyDocuments\3dPrint\bricklayers.py" on file C:\Users\gary\AppData\Local\Temp.135372_0.gcode.pp failed.
Error code: 1

Thank you for any help on what is going wrong.
Gary