I have 3 AB straight track guidance lines that won't unload to Apex.

The unload failure error message is:

SQLiteException: Abort due to constraint violation

columns CurvedTrackLineName, FieldOID are not unique. See the inner exception for details. 

This makes me think that the name of a curved track line is the same as one of my straight tracks, which isn't the case.  Does anyone know if there are some restrictions on how you can name lines?  I might have used a "/" in the name, like 2016 striptill E/W.  Another thought is that i used that same name on lines in different fields.  That's Ok, isn't it?

TIA.

Tom