"Failed to invoke function 'onSection'" when post processing from Fusion

Autodesk Support

Feb 3, 2025

Products and versions covered

Issue:

Users reported that the following appears when post processing from Fusion:

The NC Program reads:

"Error: Failed to invoke function 'onSection'."

Hovering over the Error next to the NCProgram shows the following:

"Parameters
Invalid NC Program"
Parameters Invalid NC Program when hovering over NC Program

The message appears in the bottom right of Fusion:

"NC code failed to post"

The program Error Log shows the following:

Failed to invoke 'onSection' in the post configuration shows in error log

Error: Failed to post process. See below for details.
Error: Failed to invoke function 'onSection'.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Failed to invoke 'onSection' in the post configuration.
Error: Failed to invoke function 'onClose'.
Error: Failed to invoke 'onClose' in the post configuration.
Error: Failed to execute configuration.
Stop time: Tue Aug 11 06:43:08 2020
Post processing failed.

Causes:

Incorrect setup axis aligned.

Solution:

Check the following

Download and use the recent version of Post Processor from the Fusion post library.
Check Post processor is configured for 5 axis machining or only for 3 axis.
Make sure that the WCS is set correctly for Milling or Turning or a Mill-Turn machine.

If posting a 4-axis operation

Ensure the Machine's rotary axis is configured correctly. See Defining the direction of a rotary axis in Fusion.
Ensure that all Tool Orientation selection(s) are possible for the 4th axis machine / post processor.
- For example, a Z-axis Tool Orientation selection must be either; a surface parallel to the rotary axis, or an edge perpendicular to the rotary axis. Anything off of that physically requires 5 axis to get to that orientation.
Consider setting up a machine configuration