topic Re: Transform Route Events tool fails with ERROR 999999 while transforming point events between route feature classes in ArcGIS Pro Questions

Transform Route Events tool fails with ERROR 999999 while transforming point events between route feature classes

MUKESHBajaj007 — Wed, 05 Aug 2026 09:17:05 GMT

Hi,

I'm encountering an issue with the Transform Route Events (Linear Referencing Tools) tool in ArcGIS Pro.

Environment

ArcGIS Pro Version: 3.6

Problem

The Transform Route Events tool fails immediately with the following error: ERROR 999999: Something unexpected caused the tool to fail.
Contact Esri Technical Support to Report a Bug, and refer to the error help for potential solutions or workarounds.

Re: Transform Route Events tool fails with ERROR 999999 while transforming point events between route feature classes

Robert_LeClair — Wed, 05 Aug 2026 13:59:47 GMT

Try these common fixes for ERROR 999999 with Transform Route Events in ArcGIS Pro 3.6 (it’s a generic “unhandled” tool failure):

Repair geometry on the routes and any feature class inputs involved, then rerun: Data Management > Features > Repair Geometry.
Avoid shapefiles/CSV for inputs or outputs: export everything to a file geodatabase (FGDB) table/feature class and use those.
Use a short, simple output path and name (no special characters; don’t start with a number; avoid deep folders).
Test a small subset (select a few routes/events and export to a new FC/table; run the tool on that). If it works, process in chunks.
Run ArcGIS Pro as Administrator to rule out permission/write issues.

Re: Transform Route Events tool fails with ERROR 999999 while transforming point events between route feature classes

AyanPalit — Wed, 05 Aug 2026 14:12:48 GMT

@MUKESHBajaj007 Sorry, you are running into the generic error message. This is usually schema and/or data related and @Robert_LeClair has great pointers. I can take a look if you are willing to post a small sample of the routes and events.