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

[MUKESHBajaj007]

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.

[Robert_LeClair]

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

1. Repair geometry on the routes and any feature class inputs involved, then rerun: Data Management > Features > Repair Geometry.

2. Avoid shapefiles/CSV for inputs or outputs: export everything to a file geodatabase (FGDB) table/feature class and use those.

3. Use a short, simple output path and name (no special characters; don’t start with a number; avoid deep folders).

4. 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.

5. Run ArcGIS Pro as Administrator to rule out permission/write issues.
   
   

[AyanPalit]

@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.