The earliest recollection of this bug is traced back to PAN-OS 8.1.11 - January 09, 2024.
This bug is fixed in PAN-OS versions 8.1.11.
Fixed an issue where a typo in the MIB definition file caused an error message: ERROR: Cannot find symbol panSctpDIamAvpCode when you loaded a PAN-TRAPS.my file.
For more information:
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-11-addressed-issues